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 

机构地区：[1]International Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials,Department of Materials Science and Engineering, Zhejiang University [2]Department of Mechanical Engineering, University of Nevada, Reno, NV 89557, USA [3]State Key Laboratory of Modern Optical Instrumentation, Zhejiang University

出　　处：《Journal of Materials Science & Technology》2014年第6期595-598,共4页材料科学技术（英文版）

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

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.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.

关 键 词：Bulk metallic glass Tension test Elastic-plastic deformation 

分 类 号：TG139.8[一般工业技术—材料科学与工程]