Intermetallics最新文献

英文中文

Enhanced corrosion resistance of gradient structured CoCrFeMnNi high entropy alloy by laser surface heat-treatment process

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-07 DOI: 10.1016/j.intermet.2024.108635

Jingge Li , Yu Cao , Chengchi Wang, Yongqiang Hu, Feiyue Tu, Dehua Zhu, Jie Chen

The corrosion behavior of the gradient structured CoCrFeMnNi high entropy alloys (HEAs) which has excellent strength-ductility synergy is investigated in this study. Compared to the conventional fine-grained and coarse-grained structures, the gradient structured CoCrFeMnNi HEAs exhibits better corrosion resistance, which can be demonstrated by the highest corrosion potential of ∼−0.34 V, lowest corrosion current density of ∼1.07×10⁻⁷ A/cm², maximal impedance modulus of ∼4.72×10⁴ Ω·cm², maximum charge transfer resistance of ∼3.41×10⁵ Ω·cm², least serious corrosion pits, and smallest corrosion rate of ∼7.384 g·m⁻²·h⁻¹. The passive film generated on the gradient structured sample which is characterized by low density of charge carrier has relatively high content of Cr/Fe oxides and bound water, along with the low content of Mn oxide. The enhanced corrosion resistance in the gradient structured CoCrFeMnNi HEAs is mainly attributed to the interaction between soft surface severed as cathode and anode zone characterized by relatively high microhardness in middle region. That is, the cathodic soft region combined with the high-density grain boundary of central region accelerates the formation of passive film with higher Cr content on the hard center layer, while the anodic hard zone improves the anti-corrosion of soft layer due to the cathodic protection and transferred electrons. Therefore, gradient structure is a great method to simultaneously increase the strength-ductility synergy and corrosion resistance, suggesting a promising prospect for industrial applications.

{"title":"Enhanced corrosion resistance of gradient structured CoCrFeMnNi high entropy alloy by laser surface heat-treatment process","authors":"Jingge Li , Yu Cao , Chengchi Wang, Yongqiang Hu, Feiyue Tu, Dehua Zhu, Jie Chen","doi":"10.1016/j.intermet.2024.108635","DOIUrl":"10.1016/j.intermet.2024.108635","url":null,"abstract":"<div><div>The corrosion behavior of the gradient structured CoCrFeMnNi high entropy alloys (HEAs) which has excellent strength-ductility synergy is investigated in this study. Compared to the conventional fine-grained and coarse-grained structures, the gradient structured CoCrFeMnNi HEAs exhibits better corrosion resistance, which can be demonstrated by the highest corrosion potential of ∼−0.34 V, lowest corrosion current density of ∼1.07×10<sup>−7</sup> A/cm<sup>2</sup>, maximal impedance modulus of ∼4.72×10<sup>4</sup> Ω·cm<sup>2</sup>, maximum charge transfer resistance of ∼3.41×10<sup>5</sup> Ω·cm<sup>2</sup>, least serious corrosion pits, and smallest corrosion rate of ∼7.384 g·m<sup>−2</sup>·h<sup>−1</sup>. The passive film generated on the gradient structured sample which is characterized by low density of charge carrier has relatively high content of Cr/Fe oxides and bound water, along with the low content of Mn oxide. The enhanced corrosion resistance in the gradient structured CoCrFeMnNi HEAs is mainly attributed to the interaction between soft surface severed as cathode and anode zone characterized by relatively high microhardness in middle region. That is, the cathodic soft region combined with the high-density grain boundary of central region accelerates the formation of passive film with higher Cr content on the hard center layer, while the anodic hard zone improves the anti-corrosion of soft layer due to the cathodic protection and transferred electrons. Therefore, gradient structure is a great method to simultaneously increase the strength-ductility synergy and corrosion resistance, suggesting a promising prospect for industrial applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108635"},"PeriodicalIF":4.3,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and tribological properties of ultrasonic vibration assisted high-speed laser cladding (CoCrNi) 88Al6Ti6-cBN coatings

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-06 DOI: 10.1016/j.intermet.2025.108644

Yueyang Yu , Yang Li , Na Tan , Honglin Mou , Zhiguo Xing , Jian Liu , Xian Du , Jing Li , Zhihai Cai , Haidou Wang

The method of ultrasonic vibration assisted coating preparation has been widely concerned. In this study, (CoCrNi)₈₈Al₆Ti₆-cBN composite coatings were prepared on GH4169 via ultrasonic vibration assisted high-speed laser cladding. The influence of ultrasonic vibration power on the forming quality, microstructure, hardness, and wear resistance of the coatings was studied. Based on the effect of fine grain strengthening and dispersion strengthening, compared with the coating without ultrasonic vibration, the grain size is reduced by 43 %, the hardness is increased by 16 %, and the wear resistance is increased by 30 % when the ultrasonic vibration power is 1200 W. This study can provide ideas for the research of nickel-based alloy coatings.

引用次数: 0

Effect of heat treatment on interfacial microstructure and mechanical properties of the aluminum/steel joints with copper transition layer

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-06 DOI: 10.1016/j.intermet.2025.108646

Huajing Weng , Jian Wang , Xiaolei Zhu , Xiaofeng Lu

In this study, aluminum/steel joints with a copper transition layer are successfully fabricated using wire-arc directed energy deposition (DED) based on the cold metal transfer (CMT) process. The influence of heat treatment on aluminum/steel joints is investigated, focusing on the evolution mechanisms of interfacial microstructures and the regulation of the mechanical properties. The interfacial compound (IMC) layer at the copper-aluminum interface is predominantly composed of CuAl, Cu₉Al₄, and CuAl₂. The transition layer above the IMC layer is composed of α-Al, CuAl₂, Al₇Cu₂Fe, and Al-Si eutectic phase. As the annealing temperature increases and the holding time prolongs, a substantial number of IMCs are generated within the copper-aluminum interface layer, leading to an augmentation in the interfacial layer thickness and an enhancement in the interfacial hardness. When the heat treatment temperature reaches 480 °C, the interfacial hardness increases to 447 HV_0.2, while the tensile strength decreases to 22.2 MPa. Conversely, with a solution temperature of 180 °C for 1 h, the tensile strength reaches 74.3 MPa, marking a 39 % improvement over the untreated aluminum/steel joint. The results provide guidance for the fabrication of aluminum/steel joints.

{"title":"Effect of heat treatment on interfacial microstructure and mechanical properties of the aluminum/steel joints with copper transition layer","authors":"Huajing Weng , Jian Wang , Xiaolei Zhu , Xiaofeng Lu","doi":"10.1016/j.intermet.2025.108646","DOIUrl":"10.1016/j.intermet.2025.108646","url":null,"abstract":"<div><div>In this study, aluminum/steel joints with a copper transition layer are successfully fabricated using wire-arc directed energy deposition (DED) based on the cold metal transfer (CMT) process. The influence of heat treatment on aluminum/steel joints is investigated, focusing on the evolution mechanisms of interfacial microstructures and the regulation of the mechanical properties. The interfacial compound (IMC) layer at the copper-aluminum interface is predominantly composed of CuAl, Cu<sub>9</sub>Al<sub>4</sub>, and CuAl<sub>2</sub>. The transition layer above the IMC layer is composed of α-Al, CuAl<sub>2</sub>, Al<sub>7</sub>Cu<sub>2</sub>Fe, and Al-Si eutectic phase. As the annealing temperature increases and the holding time prolongs, a substantial number of IMCs are generated within the copper-aluminum interface layer, leading to an augmentation in the interfacial layer thickness and an enhancement in the interfacial hardness. When the heat treatment temperature reaches 480 °C, the interfacial hardness increases to 447 HV<sub>0.2</sub>, while the tensile strength decreases to 22.2 MPa. Conversely, with a solution temperature of 180 °C for 1 h, the tensile strength reaches 74.3 MPa, marking a 39 % improvement over the untreated aluminum/steel joint. The results provide guidance for the fabrication of aluminum/steel joints.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108646"},"PeriodicalIF":4.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ alloying of metal particle-reinforced CoCrNi medium-entropy alloy via laser powder bed fusion

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-06 DOI: 10.1016/j.intermet.2025.108643

Hongming Yang , Hu zhen , Minghui Li , Gengchen Li , Yuefei Jia , Shiwei Wu , Xilei Bian , Yongkun Mu , Kang Sun , Yandong Jia , Gang Wang

Medium-entropy alloys (MEAs) have emerged as a promising class of materials, offering a unique combination of superior mechanical properties over their conventional counterparts. This study explores the development of metal particle-reinforced CoCrNi medium-entropy alloys (MPR-MEAs) with in-situ alloying by using laser powder bed fusion (LPBF) on mixed elemental powder blends. By optimizing the LPBF process parameters, a homogeneous distribution of incompletely melted Cr particles is achieved within the CoCrNi matrix, resulting in high-strength MPR-MEAs. The as-built CoCrNi MPR-MEA exhibits a tensile strength of approximately 734 MPa, which is nearly three times that of the as-cast CoCrNi MEA, while still maintaining an elongation of 15 %. The remarkable increase in strength is attributed to the synergistic effects of grain boundary strengthening, thermal mismatch strengthening, and dislocation strengthening. The fracture behavior is characterized by a combination of brittle and ductile modes, with microcracks nucleating from the interior of the incompletely melted chromium particles. Importantly, the chromium particle-matrix interface exhibits no signs of cracking, indicating an excellent metallurgical bond, which does not act as a crack initiator. This study demonstrates the potential of LPBF in-situ alloying for fabricating high-strength MEA composites, providing valuable insights into the design and optimization of advanced metal matrix composites for engineering applications.

{"title":"In-situ alloying of metal particle-reinforced CoCrNi medium-entropy alloy via laser powder bed fusion","authors":"Hongming Yang , Hu zhen , Minghui Li , Gengchen Li , Yuefei Jia , Shiwei Wu , Xilei Bian , Yongkun Mu , Kang Sun , Yandong Jia , Gang Wang","doi":"10.1016/j.intermet.2025.108643","DOIUrl":"10.1016/j.intermet.2025.108643","url":null,"abstract":"<div><div>Medium-entropy alloys (MEAs) have emerged as a promising class of materials, offering a unique combination of superior mechanical properties over their conventional counterparts. This study explores the development of metal particle-reinforced CoCrNi medium-entropy alloys (MPR-MEAs) with in-situ alloying by using laser powder bed fusion (LPBF) on mixed elemental powder blends. By optimizing the LPBF process parameters, a homogeneous distribution of incompletely melted Cr particles is achieved within the CoCrNi matrix, resulting in high-strength MPR-MEAs. The as-built CoCrNi MPR-MEA exhibits a tensile strength of approximately 734 MPa, which is nearly three times that of the as-cast CoCrNi MEA, while still maintaining an elongation of 15 %. The remarkable increase in strength is attributed to the synergistic effects of grain boundary strengthening, thermal mismatch strengthening, and dislocation strengthening. The fracture behavior is characterized by a combination of brittle and ductile modes, with microcracks nucleating from the interior of the incompletely melted chromium particles. Importantly, the chromium particle-matrix interface exhibits no signs of cracking, indicating an excellent metallurgical bond, which does not act as a crack initiator. This study demonstrates the potential of LPBF in-situ alloying for fabricating high-strength MEA composites, providing valuable insights into the design and optimization of advanced metal matrix composites for engineering applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108643"},"PeriodicalIF":4.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The fabrication and characterization of new NiCuTiZrFe high entropy shape memory alloys with exceptional functionality

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-06 DOI: 10.1016/j.intermet.2025.108641

Bing Zhou , Bowen Jiang , Shangzhou Zhang , Xiaoyang Yi , Guoqiang Fu , Haizhen Wang

In the present study, the multicomponent Ni₂₅Cu₂₅Ti_35-XZr₁₅Fe_X (X = 3, 5, 7, 10) high-entropy shape memory alloys (HESMAs) were designed. Moreover, the effect of Fe content on the microstructural features, martensitic transformation behaviors and mechanical/functional performances was investigated. The results demonstrated that the as-casted NiCuTiZrFe HESMAs exhibited the typical dendritic structures. The as-casted Ni₂₅Cu₂₅Ti_35-XZr₁₅Fe_X HESMAs with the lower Fe content consisted of B2 phase and HCP phase. With Fe content increasing, the amount of FCC phase gradually increased. In proportion, the fracture strength of as-casted Ni25Cu25Ti32Zr15FeX HESMAs continuously decreased from 2019 MPa to 1364 MPa, meanwhile the microhardness was also reduced from 593.33 HV to 146 HV, as Fe content increased from 3.0 at.% to 10.0 at.%. In contrast, the as-casted Ni₂₅Cu₂₅Ti₃₂Zr₁₅Fe₃ HESMAs exhibited a superior combination of higher compressive strength and microhardness as well as the excellent superelasticity with the recoverable strain of 7 %. Furthermore, the Ni₂₅Cu₂₅Ti₃₂Zr₁₅Fe₃ HESMAs demonstrated the good superelasticity stability, which can be ascribed to the saturated higher density dislocations during the initial compressive cycles.

{"title":"The fabrication and characterization of new NiCuTiZrFe high entropy shape memory alloys with exceptional functionality","authors":"Bing Zhou , Bowen Jiang , Shangzhou Zhang , Xiaoyang Yi , Guoqiang Fu , Haizhen Wang","doi":"10.1016/j.intermet.2025.108641","DOIUrl":"10.1016/j.intermet.2025.108641","url":null,"abstract":"<div><div>In the present study, the multicomponent Ni<sub>25</sub>Cu<sub>25</sub>Ti<sub>35-X</sub>Zr<sub>15</sub>Fe<sub>X</sub> (X = 3, 5, 7, 10) high-entropy shape memory alloys (HESMAs) were designed. Moreover, the effect of Fe content on the microstructural features, martensitic transformation behaviors and mechanical/functional performances was investigated. The results demonstrated that the as-casted NiCuTiZrFe HESMAs exhibited the typical dendritic structures. The as-casted Ni<sub>25</sub>Cu<sub>25</sub>Ti<sub>35-X</sub>Zr<sub>15</sub>Fe<sub>X</sub> HESMAs with the lower Fe content consisted of B2 phase and HCP phase. With Fe content increasing, the amount of FCC phase gradually increased. In proportion, the fracture strength of as-casted Ni25Cu25Ti32Zr15FeX HESMAs continuously decreased from 2019 MPa to 1364 MPa, meanwhile the microhardness was also reduced from 593.33 HV to 146 HV, as Fe content increased from 3.0 at.% to 10.0 at.%. In contrast, the as-casted Ni<sub>25</sub>Cu<sub>25</sub>Ti<sub>32</sub>Zr<sub>15</sub>Fe<sub>3</sub> HESMAs exhibited a superior combination of higher compressive strength and microhardness as well as the excellent superelasticity with the recoverable strain of 7 %. Furthermore, the Ni<sub>25</sub>Cu<sub>25</sub>Ti<sub>32</sub>Zr<sub>15</sub>Fe<sub>3</sub> HESMAs demonstrated the good superelasticity stability, which can be ascribed to the saturated higher density dislocations during the initial compressive cycles.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108641"},"PeriodicalIF":4.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fine-tuning Ni-W-Se coatings via SeO2 and lactic acid composition control

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-04 DOI: 10.1016/j.intermet.2024.108626

Sheng-Jie Huang , Jui-Teng Liang , Zai-Xiang Lin , Hwai-En Lin

Ni-W-Se coatings were prepared through electrodeposition using varying concentrations of SeO₂ and lactic acid in the electrolyte. The relationship between process parameters and coating properties was evaluated using analysis of variance (ANOVA). The results indicate that increasing either the SeO₂ or lactic acid concentration in the plating bath effectively enhances the coating thickness. The resulting coatings primarily consist of pure-phase Ni and Se, along with the binary compounds NiSe and WSe₂. At low lactic acid concentrations (0.15 and 0.25 M), the coating primarily consists of Ni, Se, and WSe₂. However, when the lactic acid concentration is increased to 0.35 M, under low SeO₂ concentrations (0.4 and 0.5 g L⁻¹), the deposition produces not only the existing Se and WSe₂ phases but forms the NiSe intermetallic compound. When the SeO₂ concentration is further increased to 0.6 g L⁻¹, the formation of the NiSe phase is suppressed, which reverts to a mixed phase consisting of Ni, Se, and WSe₂. The hardness of the Ni-W-Se coatings increases with the W content, reaching its highest value (484.1 HV) at SeO₂ and lactic acid concentrations of 0.6 g L⁻¹ and 0.25 M, respectively. The coating with low SeO₂ concentration and 0.15 M lactic acid (NWS-A-0.4 and NWS-A-0.5) exhibited the lowest surface roughness. The corrosion resistance of the coatings is inversely related to their Se content and surface roughness, with the NWS-A-0.4 sample showing the best corrosion resistance (I_corr: 14.13 μA cm⁻²) among all the samples.

{"title":"Fine-tuning Ni-W-Se coatings via SeO2 and lactic acid composition control","authors":"Sheng-Jie Huang , Jui-Teng Liang , Zai-Xiang Lin , Hwai-En Lin","doi":"10.1016/j.intermet.2024.108626","DOIUrl":"10.1016/j.intermet.2024.108626","url":null,"abstract":"<div><div>Ni-W-Se coatings were prepared through electrodeposition using varying concentrations of SeO<sub>2</sub> and lactic acid in the electrolyte. The relationship between process parameters and coating properties was evaluated using analysis of variance (ANOVA). The results indicate that increasing either the SeO₂ or lactic acid concentration in the plating bath effectively enhances the coating thickness. The resulting coatings primarily consist of pure-phase Ni and Se, along with the binary compounds NiSe and WSe<sub>2</sub>. At low lactic acid concentrations (0.15 and 0.25 M), the coating primarily consists of Ni, Se, and WSe<sub>2</sub>. However, when the lactic acid concentration is increased to 0.35 M, under low SeO₂ concentrations (0.4 and 0.5 g L⁻<sup>1</sup>), the deposition produces not only the existing Se and WSe₂ phases but forms the NiSe intermetallic compound. When the SeO₂ concentration is further increased to 0.6 g L⁻<sup>1</sup>, the formation of the NiSe phase is suppressed, which reverts to a mixed phase consisting of Ni, Se, and WSe₂. The hardness of the Ni-W-Se coatings increases with the W content, reaching its highest value (484.1 HV) at SeO<sub>2</sub> and lactic acid concentrations of 0.6 g L⁻<sup>1</sup> and 0.25 M, respectively. The coating with low SeO<sub>2</sub> concentration and 0.15 M lactic acid (NWS-A-0.4 and NWS-A-0.5) exhibited the lowest surface roughness. The corrosion resistance of the coatings is inversely related to their Se content and surface roughness, with the NWS-A-0.4 sample showing the best corrosion resistance (<em>I</em><sub>corr</sub>: 14.13 μA cm⁻<sup>2</sup>) among all the samples.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108626"},"PeriodicalIF":4.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic strengthening of a TiZrNiAlCu high-entropy alloy by phase transformation and nanophase precipitation under ultrahigh pressure

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-04 DOI: 10.1016/j.intermet.2024.108634

Duo Dong , Huiqing Xie , Yanyan Huang , Dongdong Zhu , Ning Fang , Tengfei Ma , Xiaohong Wang

Ultrahigh-pressure solidification is a solidification technique carried out in a high-pressure environment. It can significantly change the solidification behavior, thus affecting their mechanical properties. On this basis, this work aims to explore the feasibility of modulating the strength of TiZrNiAlCu high-entropy alloys via the ultrahigh-pressure method. The transformation of the BCC phase into the HCP phase and nanoprecipitated phase is the key to optimizing the mechanical properties under the 7 GPa high-pressure solidification condition; the hardness of the matrix W phase (TiZr-rich) increases by 16 % from 7.46 to 8.676 GPa, the yield strength increases by 19 % from 1.184 to 1.418 GPa, and the hardness of the B phase (NiAl-rich) increases by 19 % from 7.621 to 8.466 GPa. GPa to 8.466 GPa, an increase of 11 %, and the yield strength increases from 1.212 GPa to 1.378 GPa, an increase of 13 %. This work provides a new direction for microstructure based strengthening of high-entropy alloys.

{"title":"Synergistic strengthening of a TiZrNiAlCu high-entropy alloy by phase transformation and nanophase precipitation under ultrahigh pressure","authors":"Duo Dong , Huiqing Xie , Yanyan Huang , Dongdong Zhu , Ning Fang , Tengfei Ma , Xiaohong Wang","doi":"10.1016/j.intermet.2024.108634","DOIUrl":"10.1016/j.intermet.2024.108634","url":null,"abstract":"<div><div>Ultrahigh-pressure solidification is a solidification technique carried out in a high-pressure environment. It can significantly change the solidification behavior, thus affecting their mechanical properties. On this basis, this work aims to explore the feasibility of modulating the strength of TiZrNiAlCu high-entropy alloys via the ultrahigh-pressure method. The transformation of the BCC phase into the HCP phase and nanoprecipitated phase is the key to optimizing the mechanical properties under the 7 GPa high-pressure solidification condition; the hardness of the matrix W phase (TiZr-rich) increases by 16 % from 7.46 to 8.676 GPa, the yield strength increases by 19 % from 1.184 to 1.418 GPa, and the hardness of the B phase (NiAl-rich) increases by 19 % from 7.621 to 8.466 GPa. GPa to 8.466 GPa, an increase of 11 %, and the yield strength increases from 1.212 GPa to 1.378 GPa, an increase of 13 %. This work provides a new direction for microstructure based strengthening of high-entropy alloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108634"},"PeriodicalIF":4.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

NiNbTi(Al/Si) medium-entropy amorphous alloys with enhanced mechanical and thermal properties

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-04 DOI: 10.1016/j.intermet.2024.108609

Hossein Minouei , Mohsen Saboktakin Rizi , Mehdi Kheradmandfard , Sang Hun Shim , Sun Ig Hong , Nokeun Park

Medium-entropy amorphous alloys (MEAAs) have recently emerged as a distinct category of alloys, contributing significantly to both entropy effects and the development of metallic glasses. Despite the recognized importance of the entropy effect in MEAAs, its investigation in amorphous configurations has remained relatively unexplored. In this study, the thermal stability and mechanical properties of NiNbTi(Al/Si) MEAAs were tuned by adding 5 and 10 at% Al and Si. To systematically investigate the hardness, elastic modulus, thermal behavior and crystalization of NiNbTi(Al/Si) MEAAs, glassy alloys of five different compositions produced by the mechanical alloying method were studied. The results showed that (Ni₆₀Nb₂₀Ti₂₀)₉₀Si₁₀ exhibited higher thermal stability and better mechanical properties, while the addition of Al to Ni₆₀Nb₂₀Ti₂₀ alloy deteriorated both the thermal and mechanical properties. Crystallization of amorphous alloys, associated with the formation of intermetallic nanocrystals, significantly enhanced the mechanical properties. In (Ni₆₀Nb₂₀Ti₂₀)₉₀Si₁₀ glassy alloy, Si-contained intermetallics were formed after crystallization, which increased the hardness from 14.17 GPa to 22.95 GPa and the elastic modulus from 121.50 GPa to 238.34 GPa. The addition of 10 at% Si increased the onset temperature of crystallization of Ni₆₀Nb₂₀Ti₂₀ amorphous alloy from 605 to 616 °C, while the addition of 10 at% Al dramatically decreased the onset temperature of crystallization. The enhanced thermal stability and mechanical properties of Ni₆₀Nb₂₀Ti₂₀ alloy through Si addition are attributed to the formation of strong p-d hybrid covalent bonds that increase resistance to shear deformation.

{"title":"NiNbTi(Al/Si) medium-entropy amorphous alloys with enhanced mechanical and thermal properties","authors":"Hossein Minouei , Mohsen Saboktakin Rizi , Mehdi Kheradmandfard , Sang Hun Shim , Sun Ig Hong , Nokeun Park","doi":"10.1016/j.intermet.2024.108609","DOIUrl":"10.1016/j.intermet.2024.108609","url":null,"abstract":"<div><div>Medium-entropy amorphous alloys (MEAAs) have recently emerged as a distinct category of alloys, contributing significantly to both entropy effects and the development of metallic glasses. Despite the recognized importance of the entropy effect in MEAAs, its investigation in amorphous configurations has remained relatively unexplored. In this study, the thermal stability and mechanical properties of NiNbTi(Al/Si) MEAAs were tuned by adding 5 and 10 at% Al and Si. To systematically investigate the hardness, elastic modulus, thermal behavior and crystalization of NiNbTi(Al/Si) MEAAs, glassy alloys of five different compositions produced by the mechanical alloying method were studied. The results showed that (Ni<sub>60</sub>Nb<sub>20</sub>Ti<sub>20</sub>)<sub>90</sub>Si<sub>10</sub> exhibited higher thermal stability and better mechanical properties, while the addition of Al to Ni<sub>60</sub>Nb<sub>20</sub>Ti<sub>20</sub> alloy deteriorated both the thermal and mechanical properties. Crystallization of amorphous alloys, associated with the formation of intermetallic nanocrystals, significantly enhanced the mechanical properties. In (Ni<sub>60</sub>Nb<sub>20</sub>Ti<sub>20</sub>)<sub>90</sub>Si<sub>10</sub> glassy alloy, Si-contained intermetallics were formed after crystallization, which increased the hardness from 14.17 GPa to 22.95 GPa and the elastic modulus from 121.50 GPa to 238.34 GPa. The addition of 10 at% Si increased the onset temperature of crystallization of Ni<sub>60</sub>Nb<sub>20</sub>Ti<sub>20</sub> amorphous alloy from 605 to 616 °C, while the addition of 10 at% Al dramatically decreased the onset temperature of crystallization. The enhanced thermal stability and mechanical properties of Ni<sub>60</sub>Nb<sub>20</sub>Ti<sub>20</sub> alloy through Si addition are attributed to the formation of strong p-d hybrid covalent bonds that increase resistance to shear deformation.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108609"},"PeriodicalIF":4.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation mechanism of W2Zr intermetallic compound by solid-phase interdiffusion

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-03 DOI: 10.1016/j.intermet.2024.108632

Tianyu Liu , Xingwei Liu , Ling Wang , Kaihua Wang , Shun Li , Fawei Tang , Dongdong Shan , Jinxu Liu

The interdiffusion behavior between W and Zr, preferred orientation of the W₂Zr intermetallic as well as the underling mechanism were investigated. The W-Zr diffusion couple was annealing at 1300°C, 1400°C and 1500°C and then processing slow cooling and quenching respectively. The results indicated that the W₂Zr layer primarily grows toward the W side along the initial W/Zr interface, exhibiting a <111> preferred orientation. The growth direction is influenced by both the elemental concentration and atomic diffusion rates of W and Zr in the W₂Zr lattice. Zr diffusion towards W facilitates the W₂Zr formation as requiring the concentration condition of the intermetallic. Molecular dynamics simulations reveal that Zr diffuses faster than W in the W₂Zr lattice, further driving the W₂Zr layer growth towards W. Additionally, first-principle calculations of the diffusion energy barriers for the potential diffusion paths of W and Zr atoms in the W₂Zr lattice indicate that W atoms migrate along the <110> direction in the W₂Zr lattice, while Zr atoms transition along <111>. Consequently, Zr with a higher diffusion rate dominates the growth direction of W₂Zr, leading to a <111> preferred orientation. This study provides a novel perspective for analyzing the growth direction and the preferential orientation of intermetallic compound layers in reaction-diffusion systems.

{"title":"Formation mechanism of W2Zr intermetallic compound by solid-phase interdiffusion","authors":"Tianyu Liu , Xingwei Liu , Ling Wang , Kaihua Wang , Shun Li , Fawei Tang , Dongdong Shan , Jinxu Liu","doi":"10.1016/j.intermet.2024.108632","DOIUrl":"10.1016/j.intermet.2024.108632","url":null,"abstract":"<div><div>The interdiffusion behavior between W and Zr, preferred orientation of the W<sub>2</sub>Zr intermetallic as well as the underling mechanism were investigated. The W-Zr diffusion couple was annealing at 1300°C, 1400°C and 1500°C and then processing slow cooling and quenching respectively. The results indicated that the W<sub>2</sub>Zr layer primarily grows toward the W side along the initial W/Zr interface, exhibiting a <111> preferred orientation. The growth direction is influenced by both the elemental concentration and atomic diffusion rates of W and Zr in the W<sub>2</sub>Zr lattice. Zr diffusion towards W facilitates the W<sub>2</sub>Zr formation as requiring the concentration condition of the intermetallic. Molecular dynamics simulations reveal that Zr diffuses faster than W in the W<sub>2</sub>Zr lattice, further driving the W<sub>2</sub>Zr layer growth towards W. Additionally, first-principle calculations of the diffusion energy barriers for the potential diffusion paths of W and Zr atoms in the W<sub>2</sub>Zr lattice indicate that W atoms migrate along the <110> direction in the W<sub>2</sub>Zr lattice, while Zr atoms transition along <111>. Consequently, Zr with a higher diffusion rate dominates the growth direction of W<sub>2</sub>Zr, leading to a <111> preferred orientation. This study provides a novel perspective for analyzing the growth direction and the preferential orientation of intermetallic compound layers in reaction-diffusion systems.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"178 ","pages":"Article 108632"},"PeriodicalIF":4.3,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced mechanical properties of NiCoCrCuAl high entropy alloys with dual-phase microstructure

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-03 DOI: 10.1016/j.intermet.2024.108627

Fa-Chang Zhao , Xing-Ming Zhao , Rong-Da Zhao , Fu-Fa Wu , Shun-Hua Chen

The correspondence between the mechanical properties and the microstructure of NiCoCrCuAl series high-entropy alloys (HEAs) was investigated by the adjustment of face-centered cubic (FCC) and body-centered cubic (BCC) phase proportions. The results show that the NiCoCrCuAl HEAs changed from FCC to BCC phase, with the volume fraction of body-centered cubic (BCC) phase increasing from 14 % to 93 %. The microstructure of the alloys evolves from typical dendritic structure to fine equiaxed grains. The hardness of 518 Hv and the ultimate tensile strength of 1092 MPa were achieved in the NiCoCrCuAl series HEAs. The phase composition and microstructure were comprehensively analyzed based on the mixing entropy and enthalpy, atomic size, valence electron concentration, and electronegativity. The mechanical properties were analyzed from the perspective of mixture of FCC and BCC phases.

引用次数: 0

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