Journal of Materials Research and Technology-Jmr&t最新文献

英文中文

Unveiling the influence mechanism of La alloy on the oxidation behavior of Cu contact materials: A combined experimental and density functional investigation

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.042

Bingtian Li , Zhenjie Guan , AnRan Li , Ziyao Chen , Weijian Li , Liang Zhen , Wenzhu Shao

The preferential oxidation of alloying elements has long been recognized as the primary mechanism underlying the oxidation resistance of copper alloys. However, the presence of various alloy phases within the Cu matrix complicates the oxidation behavior. Herein, combined DFT calculations and antioxidation experiment were conducted to evaluate the oxidation behavior and underlying mechanism of Cu–La alloys. The results indicate that the oxidation resistance of Cu is significantly enhanced by La element with a reduced mass gain of 49% at 100 °C for 100 h. The effects of oxidation behavior of Cu₆La on the oxidation resistance of Cu is further explored by DFT calculations. It reveals that the Cu₆La phase with a low work function exhibits a strong affinity for the O atoms. However, the diffusion activation energy of the absorbed O is calculated to be lower in Cu₆La than that of O in Cu, which is conducive to mitigate the further erosion of O on Cu matrix. Moreover, the Cu₂O–La layer formed on the Cu₆La surface is more stable and the oxygen diffusion coefficient in it is lower, which impedes the entry of oxygen. This work advances the understanding of alloying effect on oxidation of Cu surfaces that can be extended to other metal surfaces.

{"title":"Unveiling the influence mechanism of La alloy on the oxidation behavior of Cu contact materials: A combined experimental and density functional investigation","authors":"Bingtian Li , Zhenjie Guan , AnRan Li , Ziyao Chen , Weijian Li , Liang Zhen , Wenzhu Shao","doi":"10.1016/j.jmrt.2025.01.042","DOIUrl":"10.1016/j.jmrt.2025.01.042","url":null,"abstract":"<div><div>The preferential oxidation of alloying elements has long been recognized as the primary mechanism underlying the oxidation resistance of copper alloys. However, the presence of various alloy phases within the Cu matrix complicates the oxidation behavior. Herein, combined DFT calculations and antioxidation experiment were conducted to evaluate the oxidation behavior and underlying mechanism of Cu–La alloys. The results indicate that the oxidation resistance of Cu is significantly enhanced by La element with a reduced mass gain of 49% at 100 °C for 100 h. The effects of oxidation behavior of Cu<sub>6</sub>La on the oxidation resistance of Cu is further explored by DFT calculations. It reveals that the Cu<sub>6</sub>La phase with a low work function exhibits a strong affinity for the O atoms. However, the diffusion activation energy of the absorbed O is calculated to be lower in Cu<sub>6</sub>La than that of O in Cu, which is conducive to mitigate the further erosion of O on Cu matrix. Moreover, the Cu<sub>2</sub>O–La layer formed on the Cu<sub>6</sub>La surface is more stable and the oxygen diffusion coefficient in it is lower, which impedes the entry of oxygen. This work advances the understanding of alloying effect on oxidation of Cu surfaces that can be extended to other metal surfaces.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 481-490"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143170465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving good comprehensive mechanical properties Mg–7Y–2Zn–1Mn alloy via regulating heat treatment prior to hot extrusion

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.035

Yulun Luo , Zhihua Dong , Bin Jiang , Zhiying Zheng , Jianxin Zhou , Yongfeng Li , Shengwen Bai , Shiyu Zhong , Jiangfeng Song , Dingfei Zhang

The influence of heat treatment prior to hot extrusion on microstructure evolution and mechanical properties are elaborated for Mg–7Y–2Zn–1Mn (wt. %) alloy containing long-period stacking ordered (LPSO) phase. Solution and aging treatment are shown to increase obviously tensile strength of the alloy, while keeping relatively high ductility. Good comprehensive mechanical properties with the ultimate tensile strength of 396 MPa, yield strength of 314 MPa, and elongation of 9.7 % are achieved by the aging treatment. It is closely correlated with the formation bimodal structure and the enhanced precipitation of γ′ and lamellar 14H-LPSO phase. While the granular 18R-LPSO phase and the kink deformation of lamellar 14H-LPSO phase are found to promote the dynamic recrystallization process during hot extrusion, the formation of large amount of γ′ and lamellar 14H-LPSO phase tends to uniform the stress and hinder the dynamic recrystallization process. Balance of the two factors contributes to the formation of bimodal structure and the improved mechanical properties. The present advances enhance the understanding required for the optimal design of thermo-mechanical process of LPSO-containing Mg alloys.

{"title":"Achieving good comprehensive mechanical properties Mg–7Y–2Zn–1Mn alloy via regulating heat treatment prior to hot extrusion","authors":"Yulun Luo , Zhihua Dong , Bin Jiang , Zhiying Zheng , Jianxin Zhou , Yongfeng Li , Shengwen Bai , Shiyu Zhong , Jiangfeng Song , Dingfei Zhang","doi":"10.1016/j.jmrt.2025.01.035","DOIUrl":"10.1016/j.jmrt.2025.01.035","url":null,"abstract":"<div><div>The influence of heat treatment prior to hot extrusion on microstructure evolution and mechanical properties are elaborated for Mg–7Y–2Zn–1Mn (wt. %) alloy containing long-period stacking ordered (LPSO) phase. Solution and aging treatment are shown to increase obviously tensile strength of the alloy, while keeping relatively high ductility. Good comprehensive mechanical properties with the ultimate tensile strength of 396 MPa, yield strength of 314 MPa, and elongation of 9.7 % are achieved by the aging treatment. It is closely correlated with the formation bimodal structure and the enhanced precipitation of γ′ and lamellar 14H-LPSO phase. While the granular 18R-LPSO phase and the kink deformation of lamellar 14H-LPSO phase are found to promote the dynamic recrystallization process during hot extrusion, the formation of large amount of γ′ and lamellar 14H-LPSO phase tends to uniform the stress and hinder the dynamic recrystallization process. Balance of the two factors contributes to the formation of bimodal structure and the improved mechanical properties. The present advances enhance the understanding required for the optimal design of thermo-mechanical process of LPSO-containing Mg alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 332-343"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal stability of Al–Zr-Sc conductor alloys during long-term elevated-temperature exposures

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.043

Quan Shao , Emad M. Elgallad , Alexandre Maltais , X.-Grant Chen

Four Al–Zr-Sc conductor alloys with 0.1–0.18 wt% Zr and 0.1–0.15 wt% Sc were processed through casting, hot rolling, heat treatments, and cold wire drawing. The mechanical properties and electrical conductivities of the alloy wires were evaluated, and the microstructures were characterized using scanning electron microscopy, transmission electron microscopy, and electron backscattering diffraction techniques. The thermal stabilities of these alloys were systematically assessed during thermal exposures at 310, 350, and 400 °C for up to 1000 h. The ultimate tensile strengths (UTSs) of four Al–Zr-Sc alloy wires reached 206–214 MPa, while the electrical conductivities were 57%–57.5% IACS. All four alloy wires were strengthened by a large number of Al₃(Sc,Zr) nanoprecipitates. With the increase in Zr or Sc content, the UTS only slightly increased, which shows a low impact of the Zr and Sc levels on the tensile strength and electrical conductivity. Notably, remarkable reduction in tensile strength and change in the deformed grain structure were not observed for the four alloy wires during thermal exposure at 310 °C for up to 1000 h. After thermal exposure at 350 °C for 200 h, all four wires still exhibited excellent thermal stabilities. With prolonged exposures at 350 and 400 °C, the alloy wires became unstable. The high-Zr-content Al-0.18Zr-0.1Sc and Al-0.18Zr-0.15Sc alloys exhibited better thermal stabilities after long-term thermal exposures at 350 and 400 °C. This study on the thermal stability of Al–Zr-Sc conductor alloys under extreme conditions provides a valuable reference for industrial applications of thermally resistant Al conductor wires.

{"title":"Thermal stability of Al–Zr-Sc conductor alloys during long-term elevated-temperature exposures","authors":"Quan Shao , Emad M. Elgallad , Alexandre Maltais , X.-Grant Chen","doi":"10.1016/j.jmrt.2025.01.043","DOIUrl":"10.1016/j.jmrt.2025.01.043","url":null,"abstract":"<div><div>Four Al–Zr-Sc conductor alloys with 0.1–0.18 wt% Zr and 0.1–0.15 wt% Sc were processed through casting, hot rolling, heat treatments, and cold wire drawing. The mechanical properties and electrical conductivities of the alloy wires were evaluated, and the microstructures were characterized using scanning electron microscopy, transmission electron microscopy, and electron backscattering diffraction techniques. The thermal stabilities of these alloys were systematically assessed during thermal exposures at 310, 350, and 400 °C for up to 1000 h. The ultimate tensile strengths (UTSs) of four Al–Zr-Sc alloy wires reached 206–214 MPa, while the electrical conductivities were 57%–57.5% IACS. All four alloy wires were strengthened by a large number of Al<sub>3</sub>(Sc,Zr) nanoprecipitates. With the increase in Zr or Sc content, the UTS only slightly increased, which shows a low impact of the Zr and Sc levels on the tensile strength and electrical conductivity. Notably, remarkable reduction in tensile strength and change in the deformed grain structure were not observed for the four alloy wires during thermal exposure at 310 °C for up to 1000 h. After thermal exposure at 350 °C for 200 h, all four wires still exhibited excellent thermal stabilities. With prolonged exposures at 350 and 400 °C, the alloy wires became unstable. The high-Zr-content Al-0.18Zr-0.1Sc and Al-0.18Zr-0.15Sc alloys exhibited better thermal stabilities after long-term thermal exposures at 350 and 400 °C. This study on the thermal stability of Al–Zr-Sc conductor alloys under extreme conditions provides a valuable reference for industrial applications of thermally resistant Al conductor wires.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 164-175"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of welding sequences on residual stress and deformation of U-rib components fabricated by laser-arc hybrid welding

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.032

Shaoning Geng, Yuantai Li, Ping Jiang, Yilin Wang, Jun Jin, Chu Han

This paper aims to investigate the influence of welding sequences on welding induced residual stress and deformation of U-rib components fabricated by laser-arc hybrid welding through experimental and numerical methods. A thermo-elastic-plastic finite element model was developed to capture the complex thermal and mechanical behavior during the U-rib welding process. The model was validated by neutron diffraction testing of residual stress in U-rib joints focusing on a typical continuous sequential welding condition. To further quantify the residual stress and residual deformation induced by different welding sequences, eight models of continuous and segmental welding sequences are conducted. The results show that the experimental and numerical results are in general agreement in terms of temperature field, melt pool morphology, residual stress, and deformation. The neutron diffraction validation shows an S-shaped curve along the potential crack propagation path in the joint and emphasizes the reliability of the model. Welding sequence has effect on the longitudinal stress in the weld and deck top of the U-rib joints but little influence on the transverse residual stress. The continuous welding sequence shows a bimodal pattern with almost identical peaks for both welds, while the segmental welding sequences clearly exhibit one peak high and one peak low. Segmental double-sided simultaneous welding with the “End→Middle←End” path significantly reduces residual deformation, decreasing the maximum bending deformation by approximately 33% compared to continuous sequential welding. This study provides theoretical and technical guidance for improving high quality fabrication of U-rib components and large welded structures using laser-arc hybrid welding.

{"title":"Influence of welding sequences on residual stress and deformation of U-rib components fabricated by laser-arc hybrid welding","authors":"Shaoning Geng, Yuantai Li, Ping Jiang, Yilin Wang, Jun Jin, Chu Han","doi":"10.1016/j.jmrt.2025.01.032","DOIUrl":"10.1016/j.jmrt.2025.01.032","url":null,"abstract":"<div><div>This paper aims to investigate the influence of welding sequences on welding induced residual stress and deformation of U-rib components fabricated by laser-arc hybrid welding through experimental and numerical methods. A thermo-elastic-plastic finite element model was developed to capture the complex thermal and mechanical behavior during the U-rib welding process. The model was validated by neutron diffraction testing of residual stress in U-rib joints focusing on a typical continuous sequential welding condition. To further quantify the residual stress and residual deformation induced by different welding sequences, eight models of continuous and segmental welding sequences are conducted. The results show that the experimental and numerical results are in general agreement in terms of temperature field, melt pool morphology, residual stress, and deformation. The neutron diffraction validation shows an S-shaped curve along the potential crack propagation path in the joint and emphasizes the reliability of the model. Welding sequence has effect on the longitudinal stress in the weld and deck top of the U-rib joints but little influence on the transverse residual stress. The continuous welding sequence shows a bimodal pattern with almost identical peaks for both welds, while the segmental welding sequences clearly exhibit one peak high and one peak low. Segmental double-sided simultaneous welding with the “End→Middle←End” path significantly reduces residual deformation, decreasing the maximum bending deformation by approximately 33% compared to continuous sequential welding. This study provides theoretical and technical guidance for improving high quality fabrication of U-rib components and large welded structures using laser-arc hybrid welding.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 726-742"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143170462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of crystallographic orientations and nanovoid on the plastic mechanism and damage behavior of single-crystal tungsten under shock

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.040

Ziyi Li, Wensheng Liu, Yunzhu Ma, Chaoping Liang

In this work, we investigated the shock response of single-crystal tungsten with pre-existing voids using nonequilibrium molecular dynamics simulations, considering four crystallographic orientations ([100], [110], [111], and [112]). The results reveal that the presence of nanovoids significantly reduces the spall strength of tungsten. For perfect single crystals, the spall strength is highest along [111] (47.65 GPa) and [112] (42.89 GPa), while [110] exhibits the lowest value (32.79 GPa). However, with a void radius of 1.644 nm, the spall strength of [111] and [112] decreases sharply to 24.14 GPa and 20.16 GPa, respectively. In contrast, the spall strength reduction is minimal for [100] and [110]. Various plastic deformation mechanisms, such as dislocation emission, twinning, and prismatic loop formation, were observed during shock compression, with distinct differences between perfect and void-containing samples. These mechanisms and the associated microstructural evolution explain the anisotropic spallation behavior and provide insights into the rapid decline in spall strength for specific orientations.

{"title":"Influence of crystallographic orientations and nanovoid on the plastic mechanism and damage behavior of single-crystal tungsten under shock","authors":"Ziyi Li, Wensheng Liu, Yunzhu Ma, Chaoping Liang","doi":"10.1016/j.jmrt.2025.01.040","DOIUrl":"10.1016/j.jmrt.2025.01.040","url":null,"abstract":"<div><div>In this work, we investigated the shock response of single-crystal tungsten with pre-existing voids using nonequilibrium molecular dynamics simulations, considering four crystallographic orientations ([100], [110], [111], and [112]). The results reveal that the presence of nanovoids significantly reduces the spall strength of tungsten. For perfect single crystals, the spall strength is highest along [111] (47.65 GPa) and [112] (42.89 GPa), while [110] exhibits the lowest value (32.79 GPa). However, with a void radius of 1.644 nm, the spall strength of [111] and [112] decreases sharply to 24.14 GPa and 20.16 GPa, respectively. In contrast, the spall strength reduction is minimal for [100] and [110]. Various plastic deformation mechanisms, such as dislocation emission, twinning, and prismatic loop formation, were observed during shock compression, with distinct differences between perfect and void-containing samples. These mechanisms and the associated microstructural evolution explain the anisotropic spallation behavior and provide insights into the rapid decline in spall strength for specific orientations.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 714-725"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ablation mechanisms of bulk Nb4AlC3 ceramics at 1600–2200 °C in nitrogen plasma flame

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.029

Ye Yu , Hao Zhang , Zhen Teng , Yiwang Bao , Man Jiang , Longsheng Chu , Qingguo Feng , Chunfeng Hu

MAX phase ceramics are promising thermal protection materials due to their excellent anti-oxidation and ablation resistance. This paper systematically investigates the ablation behaviors of Nb₄AlC₃ ceramics in nitrogen plasma flames at 1600–2200 °C. By analyzing changes in ablation rate, microstructure, and elemental composition of the surface and cross-section, the ablation evolution mechanism of Nb₄AlC₃ ceramics is elucidated. As the ablation temperature increased from 1600 °C to 2200 °C, the linear ablation rate increased from 4.17 to 12.8 μm/s, while the mass ablation rate increased from −4.12 to 22 mg/s. The surface of the ablated Nb₄AlC₃ underwent decomposition and oxidation reactions, forming oxides (NbO₂, Nb₂O₅, and Al₂O₃) on the surface. Simultaneously, NbO₂ reacted with Al₂O₃ to form molten AlNbO₄, which adhered to the surface and provided protection to the substrate. With increasing ablation temperature, O atoms continuously diffused into the matrix, resulting in a higher O content in the near-subsurface area. These findings indicate that Nb₄AlC₃ ceramics can withstand plasma flame erosion up to 2200 °C, exhibiting excellent ablation resistance. Therefore, Nb₄AlC₃ ceramics have significant potential as thermal protection materials.

{"title":"Ablation mechanisms of bulk Nb4AlC3 ceramics at 1600–2200 °C in nitrogen plasma flame","authors":"Ye Yu , Hao Zhang , Zhen Teng , Yiwang Bao , Man Jiang , Longsheng Chu , Qingguo Feng , Chunfeng Hu","doi":"10.1016/j.jmrt.2025.01.029","DOIUrl":"10.1016/j.jmrt.2025.01.029","url":null,"abstract":"<div><div>MAX phase ceramics are promising thermal protection materials due to their excellent anti-oxidation and ablation resistance. This paper systematically investigates the ablation behaviors of Nb<sub>4</sub>AlC<sub>3</sub> ceramics in nitrogen plasma flames at 1600–2200 °C. By analyzing changes in ablation rate, microstructure, and elemental composition of the surface and cross-section, the ablation evolution mechanism of Nb<sub>4</sub>AlC<sub>3</sub> ceramics is elucidated. As the ablation temperature increased from 1600 °C to 2200 °C, the linear ablation rate increased from 4.17 to 12.8 μm/s, while the mass ablation rate increased from −4.12 to 22 mg/s. The surface of the ablated Nb<sub>4</sub>AlC<sub>3</sub> underwent decomposition and oxidation reactions, forming oxides (NbO<sub>2</sub>, Nb<sub>2</sub>O<sub>5</sub>, and Al<sub>2</sub>O<sub>3</sub>) on the surface. Simultaneously, NbO<sub>2</sub> reacted with Al<sub>2</sub>O<sub>3</sub> to form molten AlNbO<sub>4</sub>, which adhered to the surface and provided protection to the substrate. With increasing ablation temperature, O atoms continuously diffused into the matrix, resulting in a higher O content in the near-subsurface area. These findings indicate that Nb<sub>4</sub>AlC<sub>3</sub> ceramics can withstand plasma flame erosion up to 2200 °C, exhibiting excellent ablation resistance. Therefore, Nb<sub>4</sub>AlC<sub>3</sub> ceramics have significant potential as thermal protection materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 360-368"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study on the effects of Nb and V on the nucleation and growth of pearlite in high-carbon steels using in-situ method

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.033

Keduo Yu , Mingxing Zhou , Min Zhu , Houxin Wang , Zhenye Chen , Weifan Yin , Xue Su , Junyu Tian , Guang Xu

The formation of pearlite in three high-carbon steels with different Nb and V additions was directly observed using a high-temperature laser scanning confocal microscope. The number densities and growth rates of pearlite nodules, and the overall pearlite transformation kinetics of pearlite were measured based on the in-situ observation results. The results show that Nb and V increase the pearlite nucleation rate due to different mechanisms. The refinement of prior austenite grain by Nb and the promotion of intragranular pearlite nucleation by V separately increase the nucleation rate. The formation of grain boundary pearlite and intragranular pearlite compete with each other in the V microalloyed steel, and the contribution of intragranular pearlite on the nucleation rate continuously increases as the transformation proceeds. In addition, the pearlite growth rate is reduced by Nb and V, resulting in the retardation of overall transformation kinetics. Moreover, the promotion of Nb on pearlite nucleation rate and its hindrance on pearlite growth and overall transformation kinetics are more pronounced than those of V.

{"title":"Comparative study on the effects of Nb and V on the nucleation and growth of pearlite in high-carbon steels using in-situ method","authors":"Keduo Yu , Mingxing Zhou , Min Zhu , Houxin Wang , Zhenye Chen , Weifan Yin , Xue Su , Junyu Tian , Guang Xu","doi":"10.1016/j.jmrt.2025.01.033","DOIUrl":"10.1016/j.jmrt.2025.01.033","url":null,"abstract":"<div><div>The formation of pearlite in three high-carbon steels with different Nb and V additions was directly observed using a high-temperature laser scanning confocal microscope. The number densities and growth rates of pearlite nodules, and the overall pearlite transformation kinetics of pearlite were measured based on the in-situ observation results. The results show that Nb and V increase the pearlite nucleation rate due to different mechanisms. The refinement of prior austenite grain by Nb and the promotion of intragranular pearlite nucleation by V separately increase the nucleation rate. The formation of grain boundary pearlite and intragranular pearlite compete with each other in the V microalloyed steel, and the contribution of intragranular pearlite on the nucleation rate continuously increases as the transformation proceeds. In addition, the pearlite growth rate is reduced by Nb and V, resulting in the retardation of overall transformation kinetics. Moreover, the promotion of Nb on pearlite nucleation rate and its hindrance on pearlite growth and overall transformation kinetics are more pronounced than those of V.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 317-324"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An all-weather anti/de-icing coating combining superhydrophobic surfaces with photothermal and electrothermal functions

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.038

Xiuzhang Qin , Jiaxu Wang , Yu Dai , Jin Xu , Jingfu Jin , Tingkun Chen , Mingqing Wang

To reduce the hazard of ice adhesion, a superhydrophobic coating with a contact angle of 150.4°, a sliding angle of 2°, and high light absorption performance was applied to the aluminum surface in the present study. The phase transition time of water on the superhydrophobic photothermal coating surface was delayed by 82.70 s compared to the freezing time of water on the aluminum alloy surface at −5 °C. Under the same light intensity, the melting time of the accumulated ice on the GPSC surface was 445.60 s; however, the melting of the covered ice on the aluminum alloy surface did not occur. The energy consumption required to melt the accreted ice on the GPSC surface using electric heat was 55.63% lower than that for melting ice on the aluminum alloy surface. The contact angle of the GPSC surface was measured at 143.6° after being impacted by 4 kg of quartz sand. Coating the material surface with GPSC could enhance the passive anti-icing performance of the material. When combined with a low-power electric heating method to melt the ice on the surface, this would create an all-weather anti/de-icing strategy that merges both active and passive approaches to remove ice from component surfaces. Additionally, the interface strain could change suddenly during the freezing process of water on different material surfaces at varying temperatures. This research could support ice monitoring techniques in the engineering field as well as assist in determining the optimal starting time for anti/de-icing methods.

{"title":"An all-weather anti/de-icing coating combining superhydrophobic surfaces with photothermal and electrothermal functions","authors":"Xiuzhang Qin , Jiaxu Wang , Yu Dai , Jin Xu , Jingfu Jin , Tingkun Chen , Mingqing Wang","doi":"10.1016/j.jmrt.2025.01.038","DOIUrl":"10.1016/j.jmrt.2025.01.038","url":null,"abstract":"<div><div>To reduce the hazard of ice adhesion, a superhydrophobic coating with a contact angle of 150.4°, a sliding angle of 2°, and high light absorption performance was applied to the aluminum surface in the present study. The phase transition time of water on the superhydrophobic photothermal coating surface was delayed by 82.70 s compared to the freezing time of water on the aluminum alloy surface at −5 °C. Under the same light intensity, the melting time of the accumulated ice on the GPSC surface was 445.60 s; however, the melting of the covered ice on the aluminum alloy surface did not occur. The energy consumption required to melt the accreted ice on the GPSC surface using electric heat was 55.63% lower than that for melting ice on the aluminum alloy surface. The contact angle of the GPSC surface was measured at 143.6° after being impacted by 4 kg of quartz sand. Coating the material surface with GPSC could enhance the passive anti-icing performance of the material. When combined with a low-power electric heating method to melt the ice on the surface, this would create an all-weather anti/de-icing strategy that merges both active and passive approaches to remove ice from component surfaces. Additionally, the interface strain could change suddenly during the freezing process of water on different material surfaces at varying temperatures. This research could support ice monitoring techniques in the engineering field as well as assist in determining the optimal starting time for anti/de-icing methods.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 152-163"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Serrated chips morphology and formation mechanism of laser additive manufactured materials for subtractive machining

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.028

Meng Liu , Guohe Li , Shanshan Zhao , Yujun Cai , Chunzheng Duan

The high-speed cutting process often results in the formation of periodic serrated chips, which can lead to fluctuations in cutting force. These fluctuations can negatively affect machining accuracy, surface roughness, and tool life. Moreover, the heterogeneous characteristics of laser additive manufactured (AM-ed) materials significantly influences chip morphology. Therefore, this study investigated the evolution mechanism of chip morphology in two types of Fe/Ni-based laser cladding layers, focusing on the effects of cutting speed. Geometric characterization, physical characterization, and deformation analysis of serrated chips were used to explore this mechanism. A four-stage composite formation model based on adiabatic shear-ductile fracture was proposed, and the effect of heterogeneous characteristics of laser AM-ed materials on chip formation was thoroughly discussed. The results show that as the cutting speed increases, the chip deformation of laser AM-ed materials intensifies, the chip morphology transitions from continuous strip chips to deformation band-type serrated chips, and eventually evolving into transition band-type serrated chips. The heterogeneous characteristics of the laser AM-ed materials promote the formation of adiabatic shear bands (ASBs) and the propagation of cracks, thereby increasing both the frequency of ASBs and the uncertainty of crack propagation directions. This leads to irregular chip geometry and non-periodic features in the serrated chips. In addition, the wear resistance of the machined surface of Fe/Ni-based laser AM-ed materials is excellent, which has a positive impact on improving the surface properties and service life of the mechanical parts.

{"title":"Serrated chips morphology and formation mechanism of laser additive manufactured materials for subtractive machining","authors":"Meng Liu , Guohe Li , Shanshan Zhao , Yujun Cai , Chunzheng Duan","doi":"10.1016/j.jmrt.2025.01.028","DOIUrl":"10.1016/j.jmrt.2025.01.028","url":null,"abstract":"<div><div>The high-speed cutting process often results in the formation of periodic serrated chips, which can lead to fluctuations in cutting force. These fluctuations can negatively affect machining accuracy, surface roughness, and tool life. Moreover, the heterogeneous characteristics of laser additive manufactured (AM-ed) materials significantly influences chip morphology. Therefore, this study investigated the evolution mechanism of chip morphology in two types of Fe/Ni-based laser cladding layers, focusing on the effects of cutting speed. Geometric characterization, physical characterization, and deformation analysis of serrated chips were used to explore this mechanism. A four-stage composite formation model based on adiabatic shear-ductile fracture was proposed, and the effect of heterogeneous characteristics of laser AM-ed materials on chip formation was thoroughly discussed. The results show that as the cutting speed increases, the chip deformation of laser AM-ed materials intensifies, the chip morphology transitions from continuous strip chips to deformation band-type serrated chips, and eventually evolving into transition band-type serrated chips. The heterogeneous characteristics of the laser AM-ed materials promote the formation of adiabatic shear bands (ASBs) and the propagation of cracks, thereby increasing both the frequency of ASBs and the uncertainty of crack propagation directions. This leads to irregular chip geometry and non-periodic features in the serrated chips. In addition, the wear resistance of the machined surface of Fe/Ni-based laser AM-ed materials is excellent, which has a positive impact on improving the surface properties and service life of the mechanical parts.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 250-264"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of material microstructure on the fragmentation results of explosively driven metal cylinders based on fracture modes

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-01-07 DOI: 10.1016/j.jmrt.2025.01.026

Yuhui Sun, Pengwan Chen, Chuan Zhao

There are many complicated fracture modes during the expansion and fracture of metal cylinders under explosive loading. The fracture mode directly affects the masses and number of fragments, that is, the distribution of fragment masses with number. However, the understanding of the factors and mechanisms that substantively affect the result of crushing is not comprehensive enough. In this paper, through macroscopic and microscopic observation of the fragments formed by explosively driven metal cylinders, the fracture modes were analyzed. And the mechanism of material microstructure on fragment mass statistics was investigated. It was found that the small and large mass fragments had different fracture modes, and the mechanism of the two kinds of fragments on the fragment mass distribution was different: (1) The scale parameter

μ

, which characterized the mass distribution of fragments, mainly depended on the number of small mass fragments, and the influence of large mass fragments was small. (2) The intergranular fracture of small mass fragments led to the influence of grain size on the masses and number of small mass fragments.

{"title":"Mechanism of material microstructure on the fragmentation results of explosively driven metal cylinders based on fracture modes","authors":"Yuhui Sun, Pengwan Chen, Chuan Zhao","doi":"10.1016/j.jmrt.2025.01.026","DOIUrl":"10.1016/j.jmrt.2025.01.026","url":null,"abstract":"<div><div>There are many complicated fracture modes during the expansion and fracture of metal cylinders under explosive loading. The fracture mode directly affects the masses and number of fragments, that is, the distribution of fragment masses with number. However, the understanding of the factors and mechanisms that substantively affect the result of crushing is not comprehensive enough. In this paper, through macroscopic and microscopic observation of the fragments formed by explosively driven metal cylinders, the fracture modes were analyzed. And the mechanism of material microstructure on fragment mass statistics was investigated. It was found that the small and large mass fragments had different fracture modes, and the mechanism of the two kinds of fragments on the fragment mass distribution was different: (1) The scale parameter <span><math><mrow><mi>μ</mi></mrow></math></span>, which characterized the mass distribution of fragments, mainly depended on the number of small mass fragments, and the influence of large mass fragments was small. (2) The intergranular fracture of small mass fragments led to the influence of grain size on the masses and number of small mass fragments.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"35 ","pages":"Pages 130-139"},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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