The dependence of shear modulus on dynamic relaxation and evolution of local structural heterogeneity in a metallic glass |
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Authors: | LS Huo JF Zeng WH Wang CT Liu Y Yang |
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Affiliation: | 1. Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, People’s Republic of China;2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China |
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Abstract: | Starting from the nanoscale structural heterogeneities intrinsic to metallic glasses (MGs), here we show that there are two concurrent contributions to their microscale quasi-static shear modulus GI: one (μ) is related to the atomic bonding strength of solid-like regions and the other (GII) to the change in the possible configurations of liquid-like regions (dynamic relaxation). Through carefully designed high-rate nanoscale indentation tests, a simple constitutive relation (μ = GI + GII) is experimentally verified. On a fundamental level, our current work provides a structure–property correlation that may be applicable to a wide range of glassy materials. |
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Keywords: | Metallic glass Elastic modulus Structural heterogeneity Nanoindentation |
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