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Dislocation loops enhance wear resistance in Ti2Zr0.75NbVx lightweight refractory medium-entropy alloys via high thermal conductivity-promoted oxide film formation

文献类型：期刊论文

作者Zhang, Xinlong4; Xiong, Zixian2; Li, Lianning4; Feng, Zhiyu4; Wu, Bingzhao4; Li, Mingcan1,4; Zhao, Chunyu3; Zhang, Lei4
刊名INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
出版日期2025-11-01
卷号132页码:13
关键词Lightweight refractory medium-entropy alloys Dislocation loops Thermal conductivity Wear resistance Molecular dynamics simulation
ISSN号0263-4368
DOI10.1016/j.ijrmhm.2025.107239
通讯作者Li, Mingcan(limingcan@xju.edu.cn) ; Zhao, Chunyu(zhaochunyu@sdfmu.edu.cn) ; Zhang, Lei(leizhang@xju.edu.cn)
英文摘要This study systematically investigates the friction and wear behavior of Ti2Zr0.75NbVx (x = 0.25, 0.5, 0.75, 1) lightweight refractory medium-entropy alloys (MEAs) and the underlying wear resistance enhancement mechanisms through a combined approach of experimental characterization and molecular dynamics (MD) simulations. The results reveal that atomic size mismatch-induced lattice distortion promotes the accumulation of residual stress, thereby facilitating the formation of dislocation loops. These dislocation loop structures significantly enhance the thermal conductivity of the material. The improved thermal conductivity accelerates the formation of dense oxide films by promoting oxygen diffusion and homogenizing the surface temperature field during friction. The oxide films effectively suppress stress concentration and plastic deformation, leading to a remarkable reduction in wear. Among the investigated alloys, the V0.5 composition exhibits the optimal wear resistance, with its dislocation loop structure not only substantially increasing the thermal conductivity (increasing from 32.4 W/(m center dot K) to 37.1 W/(m center dot K)) but also achieving the lowest average friction coefficient (0.6239) and wear rate (3.1181 x 10-4 mm3/N center dot m) compared to other compositions. This work provides important theoretical insights and experimental support for optimizing the wear resistance of lightweight refractory MEAs.
分类号二类/Q1
WOS关键词PLASTIC-DEFORMATION ; GREEN-KUBO ; MICROSTRUCTURE ; CHALLENGES ; PHASE
资助项目National Natural Science Foundation of China[52261028] ; Natural Science Foundation of Shandong Province[ZR2023QB140] ; Youth Innovation Team Development Program of Shandong Provincial Universities[2022KJ195] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region of China[2022D01C383]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001501427500002
资助机构National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province ; Youth Innovation Team Development Program of Shandong Provincial Universities ; Natural Science Foundation of Xinjiang Uygur Autonomous Region of China
其他责任者Li, Mingcan，Zhao, Chunyu，Zhang, Lei
源URL[http://dspace.imech.ac.cn/handle/311007/101769]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
2.Xinjiang Univ, Sch Mech Engn, Urumqi 830000, Peoples R China;
3.Shandong First Med Univ & Shandong Acad Med Sci, Sch Chem & Pharmaceut Engn, Tai An 271016, Peoples R China;
4.Xinjiang Univ, Xinjiang Environm & Funct Mat Engn Res Ctr, Sch Mat Sci & Engn, Urumqi 830046, Xinjiang, Peoples R China;
推荐引用方式
GB/T 7714		 Zhang, Xinlong,Xiong, Zixian,Li, Lianning,et al. Dislocation loops enhance wear resistance in Ti2Zr0.75NbVx lightweight refractory medium-entropy alloys via high thermal conductivity-promoted oxide film formation[J]. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS,2025,132:13.
APA Zhang, Xinlong.,Xiong, Zixian.,Li, Lianning.,Feng, Zhiyu.,Wu, Bingzhao.,...&Zhang, Lei.(2025).Dislocation loops enhance wear resistance in Ti2Zr0.75NbVx lightweight refractory medium-entropy alloys via high thermal conductivity-promoted oxide film formation.INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS,132,13.
MLA Zhang, Xinlong,et al."Dislocation loops enhance wear resistance in Ti2Zr0.75NbVx lightweight refractory medium-entropy alloys via high thermal conductivity-promoted oxide film formation".INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 132(2025):13.

入库方式： OAI收割

来源：力学研究所

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