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Metastable hybridized structure transformation in amorphous carbon films during friction-A study combining experiments and MD simulation

查看全文 作　　者：Yefei [1,2,3]ZHOU;Zhihao [1]CHEN;Tao [1]ZHANG;Silong [2]ZHANG;Xiaolei [1,2]XING;Qingxiang [2]YANG;Dongyang [3]LI 高影响力作者 机构地区：[1]School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;[2]State Key Laboratory of Metastable Materials Science&Technology,Yanshan University,Qinhuangdao 066004,China;[3]Chemical and Materials Engineering Department,University of Alberta,Edmonton T6G 2H5,Canada高影响力机构 出　　处：《Friction》索引2023年第11卷第9期,共16页高影响力期刊 基　　金：This work was co-supported by the National Natural Science Foundation of China(No.51905466);Aeronautical Science Foundation of China(No.201945099002);Natural Science Foundation of Hebei Province,China(Nos.E2021203191 and E2020203184);Youth Top Talent Project of Hebei Province Higher Education,China(No.BJ2019058). 摘　　要：Amorphous carbon films have attracted substantial interest due to their exceptional mechanical and tribological properties.Previous studies revealed that the amorphous carbon films exhibited lower coefficient of friction(COF)because of the transformation in bond structure from sp^(3)-C to sp^(2)-C during friction processes.However,the mechanism for such a transformation during friction is not well understood.This study is conducted to get an insight into the metastable transformation in amorphous carbon film during friction by means of experiments and molecular dynamics(MD)simulation.Relevant wear tests showed that wear of the film changed from an abrasive wear mode to a mixture of abrasion and adhesive wear,resulting in a decrease in growth rate of the wear rate after the running-in stage.It is worth noting that the sp^(3)-C atoms were increased during the running-in stage when the films contained lower sp^(3)/sp^(2) ratios.However,the formed sp^(3)-C atoms could only be short-lived and gradually transformed to sp^(2)-C atoms with the graphitization generated on the wearing surface of the films.The radial distribution function and translational order parameter indicated that the films'high sp^(3)/sp^(2) ratio led to an increased sp^(2)-C proportion on the wear scar after friction,which caused an increased structural ordering. 关 键 词：amorphous carbon film metastable transformation structural order molecular dynamics(MD)simulation tribological performance
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