Tensile Elastic Behavior of a Zr-Cu-Ag-Al Bulk Metallic Glass

作     者：Q.P.Cao J.B.Jin Q.Yu X.D.Wang D.X.Zhang Y.Jiang J.Z.Jiang 

作者机构：International Center for New-Structured Materials (ICNSM) State Key Laboratory of Silicon MaterialsDepartment of Materials Science and Engineering Zhejiang University Department of Mechanical Engineering University of Nevada Reno NV 89557 USA State Key Laboratory of Modern Optical Instrumentation Zhejiang University 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2014年第30卷第6期

页      面：595-598页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supports from the National Key Basic Research Program of China (No. 2012CB825700) the National Natural Science Foundation of China (Nos. 50701038, 10979002, 51371157 and 11179026) the Natural Science Foundation of Zhejiang Province (Nos. Y4110192 and Z1110196) the Fundamental Research Funds for the Central Universities (2014FZA4006)are gratefully acknowledged 

主　　题：Bulk metallic glass Tension test Elastic-plastic deformation 

摘      要：Tensile elastic behavior of bulk Zr46（Cu4.5/5.5Ag1/5.5）46Al8 metallic glass was experimentally investigated. It exhibited linear and non-linear time-independent elastic deformation with a demarcative stress of approximately 500 MPa within the timescale in the present work, and repeated loading-unloading before yielding did not alter stress-strain relationship. The pure linear elastic strain limit is 0.6%, significantly lower than 2% as generally reported, but still much higher than 0.1% observed for typical crystalline alloys. Deviation from linear elastic behavior at stresses higher than 500 MPa is explained here as a macroscopic manifestation of local fluctuations in elastic strain, which becomes pronounced at stresses higher than the critical value. The occurrence of non-linear elasticity is possibly also related to the sinusoidal relationship between shear stress and atomic displacement.