Intermetallics最新文献_第4页

Dependence of structure and property modification on individual doping between Cu and Ti in FeCrV multi-component alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-20 DOI: 10.1016/j.intermet.2025.108753

Zhi-hao Xu , Fang-qian Zhao , Si-zhe Diao , Ping-ping Liu , Jia-wei Bai , Wen-tuo Han , Ke-wei Gao , Li-ping Guo , Yu-fei Wang , En-gang Fu , Yong Zhang , Qian Zhan

FeCrV multi-component alloys (MCAs) with trace amounts of Cu or Ti, synthetized via mechanical alloying and spark plasma sintering, have the characteristics of nanocrystalline and nano-precipitates, which contribute to their excellent mechanical properties at room temperature. The high thermal stability of nanostructure and exceptional irradiation resistance are of great significance for evaluating their potential advantages as advanced nuclear energy materials. In the present study, the response of structural stability and mechanical properties to the doping of Cu_0.05 and Ti_0.2 (at%) in FeCrV under series of annealing temperatures and durations was investigated systematically. FeCrVCu_0.05 shows the satisfactory structure and performance stability until 600 °C for 30 h mainly due to the good thermal stability of Cu nano-precipitates (∼13 nm) and nanocrystalline (∼367 nm). In contrast, the excessive Laves phase of Fe₂Ti appeared in FeCrVTi_0.2 under the same annealing condition, exerting a detrimental impact on its high-temperature performance. Brittle FeV intermetallic compounds formed in both alloys at 800 °C for 5 h. Additionally, the irradiation resistance was evaluated by the sequential (Fe²⁺+H⁺)-He⁺ ions implantation at 450 °C. The two alloys exhibit comparable resistance to irradiation hardening, probably attributed to their similar sink strength though the dominant sink is different. Electrical properties, thermal conductivity, Young's modulus and corrosion resistance of the two alloys were also obtained. A comparative analysis of the different effects of the doping of Cu and Ti was conducted. Collectively, some relevant experimental data on FeCrV-based MCAs was supplemented for a more comprehensive understanding of this family. This work may help to offer a feasible basis for further optimization of new MCAs.

{"title":"Dependence of structure and property modification on individual doping between Cu and Ti in FeCrV multi-component alloys","authors":"Zhi-hao Xu , Fang-qian Zhao , Si-zhe Diao , Ping-ping Liu , Jia-wei Bai , Wen-tuo Han , Ke-wei Gao , Li-ping Guo , Yu-fei Wang , En-gang Fu , Yong Zhang , Qian Zhan","doi":"10.1016/j.intermet.2025.108753","DOIUrl":"10.1016/j.intermet.2025.108753","url":null,"abstract":"<div><div>FeCrV multi-component alloys (MCAs) with trace amounts of Cu or Ti, synthetized via mechanical alloying and spark plasma sintering, have the characteristics of nanocrystalline and nano-precipitates, which contribute to their excellent mechanical properties at room temperature. The high thermal stability of nanostructure and exceptional irradiation resistance are of great significance for evaluating their potential advantages as advanced nuclear energy materials. In the present study, the response of structural stability and mechanical properties to the doping of Cu<sub>0.05</sub> and Ti<sub>0.2</sub> (at%) in FeCrV under series of annealing temperatures and durations was investigated systematically. FeCrVCu<sub>0.05</sub> shows the satisfactory structure and performance stability until 600 °C for 30 h mainly due to the good thermal stability of Cu nano-precipitates (∼13 nm) and nanocrystalline (∼367 nm). In contrast, the excessive Laves phase of Fe<sub>2</sub>Ti appeared in FeCrVTi<sub>0.2</sub> under the same annealing condition, exerting a detrimental impact on its high-temperature performance. Brittle FeV intermetallic compounds formed in both alloys at 800 °C for 5 h. Additionally, the irradiation resistance was evaluated by the sequential (Fe<sup>2+</sup>+H<sup>+</sup>)-He<sup>+</sup> ions implantation at 450 °C. The two alloys exhibit comparable resistance to irradiation hardening, probably attributed to their similar sink strength though the dominant sink is different. Electrical properties, thermal conductivity, Young's modulus and corrosion resistance of the two alloys were also obtained. A comparative analysis of the different effects of the doping of Cu and Ti was conducted. Collectively, some relevant experimental data on FeCrV-based MCAs was supplemented for a more comprehensive understanding of this family. This work may help to offer a feasible basis for further optimization of new MCAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108753"},"PeriodicalIF":4.3,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686382","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

Microstructures and mechanical properties of Zr-based metallic glass composites plasticized with titanium wire mesh

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-20 DOI: 10.1016/j.intermet.2025.108754

Yaning Dou , Hong Li , Lele Gao , Chenyang Zhang , Zhengkun Li , Haifeng Zhang , Zhengwang Zhu

Adding a second phase to metallic glasses to prepare metallic glass composites is an effective and commonly employed approach for plasticizing metallic glasses. In this study, a newly designed die-casting process was adopted to incorporate titanium wire mesh as the second phase into the Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 (at%) metallic glass, successfully fabricating metallic glass composites with good plasticity. The detection results indicate that the interface between the second phase and the metallic glass matrix in the metallic glass composites fabricated by this process exhibited favorable metallurgical bonding, with no generation of brittle intermediate phases. Furthermore, the incorporation of the second phase can effectively induce the generation of multiple shear bands, and thereby enhance the plasticity of the metallic glass composite. The research results on mechanical properties indicate that when the wire diameter and pore size of the titanium wire mesh are 60 μm and 135 μm respectively, the compressive strength of the metallic glass composite is 1.59 ± 0.02 GPa and the compressive plastic strain reaches 11.8 ± 0.7 %. This research not only offers a novel method for the preparation of metallic glass composites but also provides a reference for the microstructure design of high-plasticity metallic glass composites.

{"title":"Microstructures and mechanical properties of Zr-based metallic glass composites plasticized with titanium wire mesh","authors":"Yaning Dou , Hong Li , Lele Gao , Chenyang Zhang , Zhengkun Li , Haifeng Zhang , Zhengwang Zhu","doi":"10.1016/j.intermet.2025.108754","DOIUrl":"10.1016/j.intermet.2025.108754","url":null,"abstract":"<div><div>Adding a second phase to metallic glasses to prepare metallic glass composites is an effective and commonly employed approach for plasticizing metallic glasses. In this study, a newly designed die-casting process was adopted to incorporate titanium wire mesh as the second phase into the Zr<sub>41.2</sub>Ti<sub>13.8</sub>Cu<sub>12.5</sub>Ni<sub>10</sub>Be<sub>22.5</sub> (at%) metallic glass, successfully fabricating metallic glass composites with good plasticity. The detection results indicate that the interface between the second phase and the metallic glass matrix in the metallic glass composites fabricated by this process exhibited favorable metallurgical bonding, with no generation of brittle intermediate phases. Furthermore, the incorporation of the second phase can effectively induce the generation of multiple shear bands, and thereby enhance the plasticity of the metallic glass composite. The research results on mechanical properties indicate that when the wire diameter and pore size of the titanium wire mesh are 60 μm and 135 μm respectively, the compressive strength of the metallic glass composite is 1.59 ± 0.02 GPa and the compressive plastic strain reaches 11.8 ± 0.7 %. This research not only offers a novel method for the preparation of metallic glass composites but also provides a reference for the microstructure design of high-plasticity metallic glass composites.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108754"},"PeriodicalIF":4.3,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686884","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

Relieving residual stress and enhanced mechanical properties by novel sandwich composites filler metal

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-19 DOI: 10.1016/j.intermet.2025.108751

Mingzhu You , Weimin Long , Guanxing Zhang , Sujuan Zhong , Hongwei Dong , Dongliang Wang , Shizhong Wei , Hua Yu , Zongye Ding

Sandwich composite filler metal is a crucial approach to relieve the residual stress and obtain a reliable joint between non-metallic and metals. A novel sandwich composite filler metal, BAg40CuZnNi/CuMn2/BAg40CuZnNiMnCo, was originally prepared by roll bonding and annealing. The microstructure, mechanical properties and residual stress of the YG15/42CrMo joints brazed were characterized by scanning electron microscope, universal testing machine, and X-ray residual stress diffractometer. During annealing, diffusion layers were formed at the BAg40CuZnNi/CuMn2/BAg40CuZnNiMnCo interfaces, the growth of the diffusion layer conformed to the parabolic relationship and was dominated by the diffusion mechanism. During the early stage of brazing, the brazing seam was divided into seven different regions, accompanied by the formation of an interfacial diffusion layer. With brazing time increased, the width of the CuMn2 interlayer in the brazing seam and the amounts of Cu-rich phase gradually decreased, while enriched the Ag-Cu eutectic structure. The increased brazing time and reduced thickness of the CuMn2 interlayer decreased the shear strength of the brazed joint. An appropriate thickness of the CuMn2 interlayer changed the microstructure in the brazing seam, reduced the residual stress on the YG15 surface, further effectively improving the shear strength of the brazed joint with dimple fracture. The results provide a reference for the brazing of nonmetals and metals.

{"title":"Relieving residual stress and enhanced mechanical properties by novel sandwich composites filler metal","authors":"Mingzhu You , Weimin Long , Guanxing Zhang , Sujuan Zhong , Hongwei Dong , Dongliang Wang , Shizhong Wei , Hua Yu , Zongye Ding","doi":"10.1016/j.intermet.2025.108751","DOIUrl":"10.1016/j.intermet.2025.108751","url":null,"abstract":"<div><div>Sandwich composite filler metal is a crucial approach to relieve the residual stress and obtain a reliable joint between non-metallic and metals. A novel sandwich composite filler metal, BAg40CuZnNi/CuMn2/BAg40CuZnNiMnCo, was originally prepared by roll bonding and annealing. The microstructure, mechanical properties and residual stress of the YG15/42CrMo joints brazed were characterized by scanning electron microscope, universal testing machine, and X-ray residual stress diffractometer. During annealing, diffusion layers were formed at the BAg40CuZnNi/CuMn2/BAg40CuZnNiMnCo interfaces, the growth of the diffusion layer conformed to the parabolic relationship and was dominated by the diffusion mechanism. During the early stage of brazing, the brazing seam was divided into seven different regions, accompanied by the formation of an interfacial diffusion layer. With brazing time increased, the width of the CuMn2 interlayer in the brazing seam and the amounts of Cu-rich phase gradually decreased, while enriched the Ag-Cu eutectic structure. The increased brazing time and reduced thickness of the CuMn2 interlayer decreased the shear strength of the brazed joint. An appropriate thickness of the CuMn2 interlayer changed the microstructure in the brazing seam, reduced the residual stress on the YG15 surface, further effectively improving the shear strength of the brazed joint with dimple fracture. The results provide a reference for the brazing of nonmetals and metals.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108751"},"PeriodicalIF":4.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643023","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

Engineering γ-TiAl alloys: The effects of Sn, Si and Mn on densification, microstructure, and mechanical properties

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-19 DOI: 10.1016/j.intermet.2025.108746

J.J.M. Ellard , M.N. Mathabathe , C.W. Siyasiya , A.S. Bolokang , V.N. Vilane , R. Rikhotso-Mbungela , C. McDuling , S. Masete

In the quest to enhance the castability of modified second-generation γ-TiAl intermetallic alloys and improve their mechanical properties, the effects of small additions of Sn, Si, and Mn were investigated and compared in terms of densification, microstructural evolution, and corresponding mechanical properties. The alloys were produced by vacuum arc remelting of blended and cold-pressed precursor powders. The processing parameters were uniformly maintained for all the alloys. According to the results, the relative green density of quaternary-Si (Ti-48Al-2Nb-0.7Cr-0.3Si) compact was the highest with a value of 90.00

\pm

0.07 %. The addition of 1 at.%Sn improved the castability of the alloy as indicated by the absence of shrinkage cavities and the highest relative density of 99.87

\pm

0.06 %. However, after heat treatment, low values of room temperature yield strength (286

\pm

23 MPa) and ultimate tensile strength (486

\pm

48 MPa) were obtained as the Sn promoted the growth of γ grains and hindered the nucleation of α₂ and Ti₅Si₃ phases. Conversely, additions of 0.3 at.%Si and 0.3 at.%Mn did not improve the castability of the alloys. However, Si promoted the nucleation of Ti₅Si₃ precipitates which improved the yield strength to 494

\pm

31 MPa and uniform elongation to 1.4

\pm

0.1 % after heat treatment. Additionally, the quaternary-Si alloy exhibited improved fatigue properties at room temperature with a fatigue limit of 388 MPa. Its fatigue fracture modes were Inter-lamellar and cleavage at lower stress amplitudes,

σ_{a}

, while inter-lamellar fracture mode dominated at higher

σ_{a}

. Mn promoted the nucleation of α₂-phase to give a moderate value of 426

\pm

19 MPa yield strength after heat treatment.

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引用次数: 0

Enhanced creep properties and creep-induced microstructure evolution behavior of carbon-doped TiAl alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-19 DOI: 10.1016/j.intermet.2025.108749

Ye Tian , Qingchao Li , Zhenquan Liang , Shulong Xiao , Xinyi Li , Xicheng Wang , Lijuan Xu , Jing Tian , Yuyong Chen

In this paper, the tensile creep experiments at 750–850 °C under 150 MPa were conducted on Ti-43Al-6Nb-1Mo-1Cr (at.%) alloy and Ti-43Al-6Nb-1Mo-1Cr-0.5C alloy. The findings reveal that the high-temperature creep performance of both alloys exhibits significant sensitivity to the creep temperature. Introducing the C element leads to a significant reduction in the steady-state creep rate and enhances the creep performance of TiAl alloys. Furthermore, the creep apparent activation energy increases from 334.52 kJ mol⁻¹ to 350.85 kJ mol⁻¹ following the introduction of C. Microstructure evolution during creep encompasses several typical types: (i) dynamic recrystallization, which predominantly occurs at the lamellar colony boundaries and has a softening effect; (ii) phase transformation from the B2 phase to the γ phase, leading to the formation of ellipsoidal γ phases within the blocky B2 phase and at the B2/γ phase interface; (iii) lamellar degradation, it causes B2 phase to precipitate at the interface of lamellae; (iv) the precipitation of carbides, C element dissolves completely in the initial microstructure and precipitates dynamically during creep. Carbides can pin dislocations and induce the generation of twins, thereby enhancing the creep performances of alloys. Furthermore, an increase in temperature will promote microstructure evolution, resulting in increased dynamic recrystallization, larger-sized γ phase, more lamellar degradation and more carbides.

{"title":"Enhanced creep properties and creep-induced microstructure evolution behavior of carbon-doped TiAl alloys","authors":"Ye Tian , Qingchao Li , Zhenquan Liang , Shulong Xiao , Xinyi Li , Xicheng Wang , Lijuan Xu , Jing Tian , Yuyong Chen","doi":"10.1016/j.intermet.2025.108749","DOIUrl":"10.1016/j.intermet.2025.108749","url":null,"abstract":"<div><div>In this paper, the tensile creep experiments at 750–850 °C under 150 MPa were conducted on Ti-43Al-6Nb-1Mo-1Cr (at.%) alloy and Ti-43Al-6Nb-1Mo-1Cr-0.5C alloy. The findings reveal that the high-temperature creep performance of both alloys exhibits significant sensitivity to the creep temperature. Introducing the C element leads to a significant reduction in the steady-state creep rate and enhances the creep performance of TiAl alloys. Furthermore, the creep apparent activation energy increases from 334.52 kJ mol<sup>−1</sup> to 350.85 kJ mol<sup>−1</sup> following the introduction of C. Microstructure evolution during creep encompasses several typical types: (i) dynamic recrystallization, which predominantly occurs at the lamellar colony boundaries and has a softening effect; (ii) phase transformation from the B2 phase to the γ phase, leading to the formation of ellipsoidal γ phases within the blocky B2 phase and at the B2/γ phase interface; (iii) lamellar degradation, it causes B2 phase to precipitate at the interface of lamellae; (iv) the precipitation of carbides, C element dissolves completely in the initial microstructure and precipitates dynamically during creep. Carbides can pin dislocations and induce the generation of twins, thereby enhancing the creep performances of alloys. Furthermore, an increase in temperature will promote microstructure evolution, resulting in increased dynamic recrystallization, larger-sized γ phase, more lamellar degradation and more carbides.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108749"},"PeriodicalIF":4.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643024","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

Electrodeposition and properties of Ni-Co-W-(Mo-Cu) high/medium entropy alloy coatings deposited from an aqueous bath

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-18 DOI: 10.1016/j.intermet.2025.108744

D. Ahmadkhaniha , D. Ascani , M. Fedel , C. Zanella

This study aimed to deposit multi-elemental coatings, including Ni-Co-Mo-W, Ni-Co-Cu-W and Ni-Co-Cu-Mo-W, with different configurational entropy from an aqueous bath by direct current electrodeposition. For this purpose, the effect of current density on the elemental composition was studied, and it was shown that the induced deposition of W was mainly controlled by Co, while the induced deposition of Mo was affected by both Ni and Co. In addition, Ni showed an activation deposition mechanism, while Mo suffered from concentration polarization for a prolonged electrodeposition process. All elements deposited homogeneously through the coatings' thickness except Cu showed some segregation. However, XRD spectra proved to have an amorphous structure for all coatings. Upon heat treatment, the crystallization of the coatings occurs, which results in an increase in hardness values from 5.6 to 11 GPa by increasing the heat treatment temperature up to 800 °C in the case of Ni-Co-Mo-W coating. The maximum hardness values were achieved at 500 °C in other coatings, and then a slight decrease was observed. Polarization results of the as-deposited coatings showed the potential for passivation of these coatings. However, due to the defects in the coatings, they were not completely protective towards the substrate. The results suggest that the presence of Cu had the main impact on the coating's properties since it decreased Co deposition, the hardness and the thermal stability of the coatings.

{"title":"Electrodeposition and properties of Ni-Co-W-(Mo-Cu) high/medium entropy alloy coatings deposited from an aqueous bath","authors":"D. Ahmadkhaniha , D. Ascani , M. Fedel , C. Zanella","doi":"10.1016/j.intermet.2025.108744","DOIUrl":"10.1016/j.intermet.2025.108744","url":null,"abstract":"<div><div>This study aimed to deposit multi-elemental coatings, including Ni-Co-Mo-W, Ni-Co-Cu-W and Ni-Co-Cu-Mo-W, with different configurational entropy from an aqueous bath by direct current electrodeposition. For this purpose, the effect of current density on the elemental composition was studied, and it was shown that the induced deposition of W was mainly controlled by Co, while the induced deposition of Mo was affected by both Ni and Co. In addition, Ni showed an activation deposition mechanism, while Mo suffered from concentration polarization for a prolonged electrodeposition process. All elements deposited homogeneously through the coatings' thickness except Cu showed some segregation. However, XRD spectra proved to have an amorphous structure for all coatings. Upon heat treatment, the crystallization of the coatings occurs, which results in an increase in hardness values from 5.6 to 11 GPa by increasing the heat treatment temperature up to 800 °C in the case of Ni-Co-Mo-W coating. The maximum hardness values were achieved at 500 °C in other coatings, and then a slight decrease was observed. Polarization results of the as-deposited coatings showed the potential for passivation of these coatings. However, due to the defects in the coatings, they were not completely protective towards the substrate. The results suggest that the presence of Cu had the main impact on the coating's properties since it decreased Co deposition, the hardness and the thermal stability of the coatings.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108744"},"PeriodicalIF":4.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643022","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

Comparison of microstructural characteristics, phase transformation and wear behavior of Ni50.8Ti49.2 shape memory alloy fabricated by LPBF versus conventional casting

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-17 DOI: 10.1016/j.intermet.2025.108694

Zhenze Liu , Lunxiang Li , Yong Li , Liangtian Tang , Chunling Mao , Hu Xiao , Kongyuan Yang , Panpan Li , Ping Liang , Zhenglei Yu

This study investigates the microstructural, phase transformation behavior, mechanical, and wear resistance of Ni_50.8Ti_49.2 shape memory alloys (SMAs) produced through Laser-Powder Bed Fusion (LPBF) techniques compared to conventional casting. It was found that LPBF-NiTi alloy exhibited a reduced grain size and a notably increased phase transformation temperature, accompanied by a latent heat of transformation that is twice as high as that observed in NiTi ingots. LPBF-NiTi alloy exhibits better corrosion resistance and superior wear compared to NiTi ingots. The wear volume of LPBF-NiTi samples was quantitatively assessed to be 27.7 % inferior to that of NiTi ingot. The repeated thermal cycling during LPBF causes Ni evaporation in NiTi phase, reducing critical stress for martensitic transformation. LPBF-NiTi sample is highly susceptible to martensitic transformation under the same contact load. Moreover, smaller grain sizes, a higher relative density of dislocations, and the lattice distortions and strain fields induced by Ti₄Ni₂O_x precipitates significantly enhance the strength of LPBF-NiTi samples. This research offers theoretical insights for the practical application of LPBF-NiTi alloy in manufacturing wear-resistant components with complex geometries for engineering purposes.

{"title":"Comparison of microstructural characteristics, phase transformation and wear behavior of Ni50.8Ti49.2 shape memory alloy fabricated by LPBF versus conventional casting","authors":"Zhenze Liu , Lunxiang Li , Yong Li , Liangtian Tang , Chunling Mao , Hu Xiao , Kongyuan Yang , Panpan Li , Ping Liang , Zhenglei Yu","doi":"10.1016/j.intermet.2025.108694","DOIUrl":"10.1016/j.intermet.2025.108694","url":null,"abstract":"<div><div>This study investigates the microstructural, phase transformation behavior, mechanical, and wear resistance of Ni<sub>50.8</sub>Ti<sub>49.2</sub> shape memory alloys (SMAs) produced through Laser-Powder Bed Fusion (LPBF) techniques compared to conventional casting. It was found that LPBF-NiTi alloy exhibited a reduced grain size and a notably increased phase transformation temperature, accompanied by a latent heat of transformation that is twice as high as that observed in NiTi ingots. LPBF-NiTi alloy exhibits better corrosion resistance and superior wear compared to NiTi ingots. The wear volume of LPBF-NiTi samples was quantitatively assessed to be 27.7 % inferior to that of NiTi ingot. The repeated thermal cycling during LPBF causes Ni evaporation in NiTi phase, reducing critical stress for martensitic transformation. LPBF-NiTi sample is highly susceptible to martensitic transformation under the same contact load. Moreover, smaller <em>grain sizes,</em> a higher relative density of dislocations, and the lattice distortions and strain fields induced by Ti<sub>4</sub>Ni<sub>2</sub>O<sub>x</sub> precipitates significantly enhance the strength of LPBF-NiTi samples. This research offers theoretical insights for the practical application of LPBF-NiTi alloy in manufacturing wear-resistant components with complex geometries for engineering purposes.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108694"},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636864","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

Unveiling deformation behavior of selective laser melted Al-doped CoCrNi medium entropy alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-17 DOI: 10.1016/j.intermet.2025.108737

Zhengtong Zhang , Jian Tu , Yu Shu , Yuting Feng , Yanxiang Liang , Yuchen Dou , Yingkun Qiu , Yanbin Du

This study investigates the effects of aluminum (Al) addition on the deformation behavior of CoCrNi medium entropy alloy (MEA) processed via selective laser melting (SLM). As-SLMed alloy exhibits a complex microstructure featuring various dislocation structures, nanoprecipitates, and stacking faults. Rolling deformation induces significant microstructural evolution, including the increased dislocation slip density, the formation of deformation bands and shear bands. The evolution of dislocation slip reveals three distinct deformation modes. The interplay between dislocations, stacking faults, and Lomer-Cottrell locks enhances the alloy's plastic deformation capacity. By calculating the twinnability of Al₈(CoCrNi)₉₂ by using first-principles calculation, the absence of deformation twinning is explained. Due to the dislocation-dominated deformation mechanism, the texture is primarily composed of Cu ({112}<111>) and Goss ({110}<001>) components.

引用次数: 0

Overcoming strength-ductility trade-off of Mg2Si via Al and O doping: First-principles and experimental investigations

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-17 DOI: 10.1016/j.intermet.2025.108739

Jinchuan Wen , Zhangxi Wu , Ming Li , Dahong Zhao , Yuanchun Huang , Yu Liu

The intrinsic brittleness of Mg₂Si severely deteriorates the mechanical properties of composites and limits their potential application as reinforcing particles. This work puts forward a cost-efficient approach to address this challenge by doping Al/O into Mg₂Si to improve the deformation coordination of Al-Mg₂Si composites. First-principles calculations revealed that Al doping alone reduced the modulus and hardness of Mg₂Si and increased its Poisson's ratio, but Al-doped Mg₂Si still exhibited brittle characteristics. O doping alone or Al/O co-doping further reduced the modulus and hardness of compounds, and realized the transformation of Mg₂Si from brittle to plastic. Additionally, the anisotropy of doped Mg₂Si was slightly increased, but Al/O co-doping suppressed the anisotropy to a certain extent compared to doping alone. The underlying mechanism is that Al doping enhanced the metallicity of the compounds, and Al/O co-doping significantly weakened the strength of Mg-Si and Si-Si covalent bonds, and formed new O-Mg and O-Si ionic bonds. Subsequently, nano-indentation experiments were carried out to test the Young's modulus and hardness of samples with different doping elements. The results, in descending order, were as follows: Al₈Si₄, Al₈Si₄Al, Al₈Si₄O, Al₈Si₄AlO, which aligned consistently with the theoretical calculations. The Young's modulus and hardness of Mg₈Si₄AlO were 72.9 GPa and 198 HV, respectively, which were approximately 48.4 % and 32.4 % lower than those of undoped Mg₂Si. This work provides valuable insights and guidance for designing novel high-strength and high-toughness composites by doping modified reinforced particles.

{"title":"Overcoming strength-ductility trade-off of Mg2Si via Al and O doping: First-principles and experimental investigations","authors":"Jinchuan Wen , Zhangxi Wu , Ming Li , Dahong Zhao , Yuanchun Huang , Yu Liu","doi":"10.1016/j.intermet.2025.108739","DOIUrl":"10.1016/j.intermet.2025.108739","url":null,"abstract":"<div><div>The intrinsic brittleness of Mg<sub>2</sub>Si severely deteriorates the mechanical properties of composites and limits their potential application as reinforcing particles. This work puts forward a cost-efficient approach to address this challenge by doping Al/O into Mg<sub>2</sub>Si to improve the deformation coordination of Al-Mg<sub>2</sub>Si composites. First-principles calculations revealed that Al doping alone reduced the modulus and hardness of Mg<sub>2</sub>Si and increased its Poisson's ratio, but Al-doped Mg<sub>2</sub>Si still exhibited brittle characteristics. O doping alone or Al/O co-doping further reduced the modulus and hardness of compounds, and realized the transformation of Mg<sub>2</sub>Si from brittle to plastic. Additionally, the anisotropy of doped Mg<sub>2</sub>Si was slightly increased, but Al/O co-doping suppressed the anisotropy to a certain extent compared to doping alone. The underlying mechanism is that Al doping enhanced the metallicity of the compounds, and Al/O co-doping significantly weakened the strength of Mg-Si and Si-Si covalent bonds, and formed new O-Mg and O-Si ionic bonds. Subsequently, nano-indentation experiments were carried out to test the Young's modulus and hardness of samples with different doping elements. The results, in descending order, were as follows: Al<sub>8</sub>Si<sub>4</sub>, Al<sub>8</sub>Si<sub>4</sub>Al, Al<sub>8</sub>Si<sub>4</sub>O, Al<sub>8</sub>Si<sub>4</sub>AlO, which aligned consistently with the theoretical calculations. The Young's modulus and hardness of Mg<sub>8</sub>Si<sub>4</sub>AlO were 72.9 GPa and 198 HV, respectively, which were approximately 48.4 % and 32.4 % lower than those of undoped Mg<sub>2</sub>Si. This work provides valuable insights and guidance for designing novel high-strength and high-toughness composites by doping modified reinforced particles.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108739"},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636860","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 tribocorrosion behavior of the Cu-based glassy composite coating produced via high velocity air-fuel thermal spraying

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-03-17 DOI: 10.1016/j.intermet.2025.108747

You Yu , Yuping Wu , Shuaishuai Zhu , Sheng Hong , Jiangbo Cheng , Junpeng Lv , Yuchuan Huang

3Cr13 stainless steel (SS), commonly applied to marine engineering components such as bearings and drive shafts, is damaged by tribocorrosion. For improving the resistance of tribocorrosion, the Cu₅₅Zr₂₅Ti₁₅Ni₅ glassy composite coating is prepared via high-velocity air-fuel (HVAF) spraying technology on 3Cr13 SS, and the tribocorrosion experiment of the coating is investigated using friction and wear tester. The coating exhibits a multiphase structure, comprising amorphous-nanocrystalline region and oxide phase consisting of TiO₂ and t-ZrO₂, of which the amorphous-nanocrystalline phase accounts for about 53 %. The nanomechanical properties and the corrosion properties are investigated. The analysis of the tribocorrosion system (counter-balls, post-tribocorrosion solution, and wear tracks) is carried out using 3D scanner, inductively coupled plasma mass spectrometer (ICP-MS) and scanning electron microscope (SEM). Abrasive wear and fatigue wear mainly occur in the coating during tribocorrosion, and adhesive wear and chemical reaction wear are slight. As the load increases, tribo-film is formed on the surface of the coating and the wear rate decreases dramatically, due to the suppression of abrasive wear. The wear rate of the coating is only half of that of 3Cr13 SS at the load of 30N.

{"title":"The tribocorrosion behavior of the Cu-based glassy composite coating produced via high velocity air-fuel thermal spraying","authors":"You Yu , Yuping Wu , Shuaishuai Zhu , Sheng Hong , Jiangbo Cheng , Junpeng Lv , Yuchuan Huang","doi":"10.1016/j.intermet.2025.108747","DOIUrl":"10.1016/j.intermet.2025.108747","url":null,"abstract":"<div><div>3Cr13 stainless steel (SS), commonly applied to marine engineering components such as bearings and drive shafts, is damaged by tribocorrosion. For improving the resistance of tribocorrosion, the Cu<sub>55</sub>Zr<sub>25</sub>Ti<sub>15</sub>Ni<sub>5</sub> glassy composite coating is prepared via high-velocity air-fuel (HVAF) spraying technology on 3Cr13 SS, and the tribocorrosion experiment of the coating is investigated using friction and wear tester. The coating exhibits a multiphase structure, comprising amorphous-nanocrystalline region and oxide phase consisting of TiO<sub>2</sub> and t-ZrO<sub>2</sub>, of which the amorphous-nanocrystalline phase accounts for about 53 %. The nanomechanical properties and the corrosion properties are investigated. The analysis of the tribocorrosion system (counter-balls, post-tribocorrosion solution, and wear tracks) is carried out using 3D scanner, inductively coupled plasma mass spectrometer (ICP-MS) and scanning electron microscope (SEM). Abrasive wear and fatigue wear mainly occur in the coating during tribocorrosion, and adhesive wear and chemical reaction wear are slight. As the load increases, tribo-film is formed on the surface of the coating and the wear rate decreases dramatically, due to the suppression of abrasive wear. The wear rate of the coating is only half of that of 3Cr13 SS at the load of 30N.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"181 ","pages":"Article 108747"},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642893","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