Tensile Elastic Behavior of a Zr-Cu-Ag-Al Bulk Metallic Glass
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第6期
论文作者：Q.P.Cao J.B.Jin Q.Yu X.D.Wang D.X.Zhang Y.Jiang J.Z.Jiang
文章页码：595 - 598
摘 要：Tensile elastic behavior of bulk Zr46（Cu4.5/5.5Ag1/5.5）46Al8metallic 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 loadingeunloading before yielding did not alter stressestrain 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.
Q.P.Cao1，J.B.Jin1，Q.Yu2，X.D.Wang1，D.X.Zhang3，Y.Jiang2，J.Z.Jiang1
1. International Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials,Department of Materials Science and Engineering, Zhejiang University2. Department of Mechanical Engineering, University of Nevada, Reno, NV 89557, USA3. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University
摘 要：Tensile elastic behavior of bulk Zr46（Cu4.5/5.5Ag1/5.5）46Al8metallic 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 loadingeunloading before yielding did not alter stressestrain 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：
