Study of metal-ceramic WC/Cu nano-wear behavior and strengthening mechanism  

作　　者：郑敏 陈杰 朱宗孝 曲定峰 陈卫华 吴卓 王林军 马学忠 Min Zheng;Jie Chen;Zong-Xiao Zhu;Ding-Feng Qu;Wei-Hua Chen;Zhuo Wu;Lin-Jun Wang;Xue-Zhong Ma(School of Mechanical and Electrical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Petroleum and Chemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]School of Mechanical and Electrical Engineering,Lanzhou University of Technology,Lanzhou 730050,China [2]School of Petroleum and Chemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China

出　　处：《Chinese Physics B》2023年第4期549-560,共12页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.52005236);the Natural Science Foundation of Gansu Province,China(Grant No.20JR5RA442)。

摘　　要：In view of the inherent poor tribological properties of copper,the reinforcement of copper matrix composites with WC particles presents a promising research area with significant industrial influence.Therefore,in the present study,a molecular dynamics approach is used to simulate the process of repeated friction of diamond grinding balls on WC/Cu composites,and the friction force,friction coefficient,abrasion depth,wear rate,abrasion morphology,von-Mises stress,internal defects,workpiece energy,and performance comparison of different layer thicknesses are systematically investigated in the multiple friction process.It is found that the fluctuation amplitude of friction force,friction coefficient,and abrasion depth are smaller and the fluctuation frequency is larger during the initial friction,whereas near the WC phase,there appears extreme values of the above parameters and the von-Mises stress is highly concentrated while the workpiece energy contonues to increase.In the case of the repeated friction,with the increase of friction times,the friction force,friction coefficient,and abrasion depth fluctuation amplitude increase,the fluctuation frequency decreases,the workpiece energy reaches an extreme value near the WC phase,and a large number of dislocations plug,therefore,the region is strengthened.As the distance between the grinding ball and the WC phase decreases,the more obvious the strengthening effect,the stronger the ability of workpiece to resist the wear will be.

关 键 词：molecular dynamics repetitive friction copper matrix composites REINFORCEMENT 

分 类 号：TG148[一般工业技术—材料科学与工程]