铜镍合金滑动摩擦学行为的分子动力学模拟  

Molecular Dynamics Simulation of Sliding Tribological Behavior of Cu-Ni Alloy

作　　者：王权 庄宿国 刘秀波 孟元 朱正兴 周安 WANG Quan;ZHUANG Suguo;LIU Xiubo;MENG Yuan;ZHU Zhengxing;ZHOU An(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Hunan Changsha 410004,China;College of Mechanical and Electrical Engineering,Northwestern Polytechnical University,Shaanxi Xi’an 710072,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]西北工业大学机电学院,陕西西安710072

出　　处：《摩擦学学报》2023年第9期1046-1054,共9页Tribology

基　　金：国家自然科学基金(52075559,52105238);湖南省重点研发项目(2022GK2030);湖南省自然科学基金(2021JJ31161)资助。

摘　　要：基于分子动力学模拟建立金刚石结构粗糙磨粒球与Ni60/10%Cu(C1)和Ni60/20%Cu(C2)铜镍合金滑动摩擦结构模型,通过探究铜镍合金在金刚石磨粒不同摩擦深度下滑动摩擦行为,结合合金的磨损形貌、磨损原子数目及分布、摩擦力和亚表面损伤对合金纳米尺度下磨损机理进行了研究.结果表明:在摩擦过程中,合金磨损原子首先堆积在磨粒前方,随着滑动摩擦的进行,当压入深度为10?时,磨损原子与磨粒之间黏附力较小,磨损原子流向磨痕两侧,当压入深度为20?时,磨损原子数量增加,增加的磨损原子主要堆积在磨粒前方,共同对合金进行磨损.随压入深度的增加,合金在摩擦过程中的位错密度上升,合金亚表面损伤程度提高,但在相同压入深度下,C2合金平均位错密度大于C1合金,C1合金的亚表面质量优于C2合金,这表明摩擦深度是影响合金亚表面质量的重要因素,且Cu原子数目增加会提高合金在纳米尺度下摩擦过程中亚表面损伤.Copper-nickel(Cu-Ni)alloy has received extensive attention because of its high corrosion resistance and remarkable physical properties.Cu-Ni alloy is widely applied to solar cells,power plants and electrical sliding contacts,etc.At present,the studies of Cu-Ni alloy concentrate on the macroscopic level,while the deformation mechanisms at the atomic level are studied rarely.Meanwhile,with the rapid development of micro/nanodevices,it is critical to investigate and disclose the nano-sized tribological properties and deformation mechanisms.This paper aimed to understand nano-tribological behaviours and deformation process of Cu-Ni alloy,because studying the distribution of atomic,lattice change and stress propagation at the atom scale could help to understand the deformation mechanism of Cu-Ni alloy.This research based on molecular dynamics simulation,the sliding friction models of diamond rough abrasive ball and Ni60/10%Cu(C1),Ni60/20%Cu(C2)copper-nickel alloy were established.The sliding friction behavior of diamond abrasive grains at different friction depths,combined with the wear morphology,number and distribution of wear atoms,friction force and subsurface damage of the alloy,the wear mechanism of the alloy under nano-size were studied.The results showed that in the friction process,the alloy wear atoms first accumulated in front of the abrasive particles.With the progress of sliding friction,when the indentation depth was 10Å,the adhesion force between the wear atoms and the abrasive particles was small,and the wear atoms flowed to the wear scar.On both sides,when the indentation depth was 20Å,the number of wear atoms increased,and the increased wear atoms were mainly accumulated in front of the abrasive particles to wear the alloy together.In addition,it was also observed that the morphologies of wear debris accumulated on the surface of the alloy were asymmetric.With the increase of indentation depth,the dislocation density of the alloy increased during the friction process,and the degree of subsurface da

关 键 词：分子动力学模拟 铜镍合金 滑动摩擦 亚表面损伤 纳米摩擦 

分 类 号：TH117.1[机械工程—机械设计及理论]