Enhancing strength and plasticity by pre-introduced indent-notches in Zr36Cu64 metallic glass:A molecular dynamics simulation study  

作　　者：Shidong Feng Lin Li K.C.Chan Lei Zhao Limin Wang Riping Liu 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,066004,China [2]Advanced Manufacturing Technology Research Centre,Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,999077,Hong Kong,China [3]Department of Metallurgical and Materials Engineering,The University of Alabama,Tuscaloosa,AL,35487,USA

出　　处：《Journal of Materials Science & Technology》2020年第8期119-125,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant 51801174;the Program for the Top Young Talents of Higher Learning Institutions of Hebei under Grant BJ2018021;the National Key R&D Program of China under Grant 2018YFA0703602;the Hong Kong Scholars Program under Grant XJ2017049;support from the National Science Foundation under grant number CMMI 17-026。

摘　　要：The deformation behavior in Zr36 Cu64 metallic glasses with pre-introduced indent-notches has been studied by molecular dynamics simulation at the atomic scale.The indent-notches can trigger the formation of densely-packed clusters composed of solid-like atoms in the indent-notch affected zone.These denselypacked clusters are highly resistant to the nucleation of shear bands.Hence,there is more tendency for the shear bands to nucleate outside the indent-notch affected zone,which enlarges the deformation region and enhances both the strengthening effect and the plastic deformation ability.For indent-notched MGs,when determining the initial yielding level,there is a competition process occurring between the densely-packed clusters leading to the shear band formation outside the indent-notch affected zone and the stress-concentration localizing deformation around the notch roots.When the indent-notch depth is small,the stress-concentration around the notch root plays a dominant role,leading to the shear bands initiating from the notch root,reminiscence of the cut-notches.As the indent-notch depth increases,there are many densely-packed clusters with high resistance to deformation in the indent-notch affected zone,leading to the shear band formation from the interface between the indent-notch affected zone and the matrix.Current research findings provide a feasible means for improving the strength and the plasticity of metallic glasses at room temperature.

关 键 词：Metallic glass NOTCH Shear band Microstructure Molecular dynamics simulation 

分 类 号：TG139.8[一般工业技术—材料科学与工程]