基于分子动力学模拟的多主元合金滑动摩擦学行为研究  

Study of Sliding Friction Behavior of Multi-Principal Element Alloys Based on Molecular Dynamics Simulation

作　　者：宋馨怡 刘秀波 孟元 周安 张世宏[2] SONG Xinyi;LIU Xiubo;MENG Yuan;ZHOU An;ZHANG Shihong(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Changsha Hunan 410004,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Anhui University of Technology,Maanshan Anhui 243002,China)

机构地区：[1]中南林业科技大学材料表界面科学与技术湖南省重点实验室,湖南长沙410004 [2]安徽工业大学先进金属材料绿色制备与表面技术重点实验室,安徽马鞍山243002

出　　处：《润滑与密封》2024年第5期36-44,共9页Lubrication Engineering

基　　金：国家自然科学基金项目(52075559,52105238);湖南省重点研发项目(2022GK2030);湖南省自然科学基金项目(2023JJ41051);先进金属材料绿色制造与表面技术重点实验室开放基金项目(GFST2023KF01)。

摘　　要：随着高性能多主元合金被相继开发并在摩擦学领域的应用迅速扩展,研究并揭示多主元合金的摩擦学行为至关重要。采用分子动力学模拟,构建多主元合金原子尺度滑动摩擦模型,研究FeCoCrNiCu(M1)、FeCoCrNi(M2)、FeNiCr(M3)3种多主元合金的表面形貌、磨损原子、摩擦力、位错及应力的演变。结果表明:M2合金在相同的划痕深度下表面变形最小、磨损粒子数最少、法向力最大,这是由于Co元素的加入使得合金的硬度增强;M1合金展现出更剧烈的塑性变形以及更复杂的位错变形,这是由于Cu元素的加入降低了合金的硬度;M1和M2合金中产生了棱柱位错环,M3合金中却没有观察到,这是由于M3合金的堆垛层错能较低难以形成棱柱位错环。研究结果对多主元合金的开发和应用提供了参考。With the successive development of a variety of high-performance multi-principal alloys with different com-positions and the rapid expansion of their applications in the field of tribology,it is crucial to study and reveal the tribologi-cal behavior of multi-principal alloys.A molecular dynamics simulation method was used to construct a friction and wear model of multi-principal alloys at the nanoscale,and the surface morphology,wear atoms,friction force,and dislocation and stresses evolution of three alloys,FeCoCrNiCu,FeCoCrNi,and FeNiCr,were investigated.The results show that the FeCoCrNi alloy has the least surface deformation,the minimum number of wear particles,and the highest normal force at the same scratch depth,which is due to the increased hardness of the alloy after adding Co element.The FeCoCrNiCu ex-hibits a more severe plastic deformation as well as more complex dislocation deformation due to the decreased hardness of the alloy after adding Cu element.The prismatic dislocation loops are observed in FeCoCrNiCu and FeCoCrNi,but not in FeNiCr.This is because the stacking fault energy of FeNiCr is relatively low,making it difficult to form prismatic dislocation loops.The research results provide a reference for the development and application of multi-principal element alloys.

关 键 词：多主元合金 合金材料 分子动力学模拟 摩擦学行为 纳米划痕 

分 类 号：TH117[机械工程—机械设计及理论]