Correlation between jerky flow and jerky dynamics in a nanoscratch on a metallic glass film  

作　　者：LiPing Yu DongXue Han JingLi Ren XiaoXiang Guo ShaoKang Guan Gang Wang 

机构地区：[1]Henan Academy of Big Data,Zhengzhou University.Zhengzhou 450052,China [2]College of Science,Henan University of Technology,Zhengzhou 450001,China [3]Laboratory for Microstructures,Institute of Materials,Shanghai University,Shanghai 200444,China [4]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2020年第7期89-92,共4页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51925103, 11771407, 51761135125, and 51671120);the China Postdoctoral Science Foundation (Grant No. 2019M651600);the Research Foundation for Advanced Talents of Henan University of Technology (Grant No. 2018BS027);the 111 Project (Grant No. D16002)

摘　　要：Chaos has been well understood in dynamic system, however, how the chaotic behavior occur in jerky flow in material, is still not clear, and is lack of specific chaotic attractor. Here the jerky evolution of lateral force and the stair-like fluctuation of lateral displacement are observed for Ni62 Nb38(at.%) metallic glass film during nanoscratch process. This jerky flow is investigated by using the largest Lyapunov exponent, Kolmogorov entropy and fractal dimension, and chaotic behavior of lateral force-time and normal displacement-lateral displacement sequences is verified. In addition to time series analysis, it is found that jerk equation can be used to describe the jerky flow of the metallic-glass film during nanoscratch. More importantly, unambiguous chaotic attractor is presented by jerky dynamics using "jerk"-singularities, namely the total change rate of lateral force relative to scratch time. These reveal an inner connection between jerky flow and jerky dynamics in nanoscratch of a metallic-glass film.

关 键 词：metallic-glass film jerky flow jerky dynamics CHAOS 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TB383.2[金属学及工艺—合金]