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Low temperature uniform plastic deformation of metallic glasses during elastic iteration |
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| Authors: | Takeshi Fujita Zheng Wang Yanhui Liu Howard Sheng Weihua Wang Mingwei Chen |
| Affiliation: | 1. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China;3. School of Physics, Astronomy and Computational Sciences, George Mason University, Fairfax, VA 22030, USA;4. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China |
| Abstract: | Molecular dynamics simulations and dynamic mechanical analysis experiments were employed to investigate the mechanical behavior of metallic glasses subjected to iteration deformation in a nominally elastic region. It was found that cyclic deformation leads to the formation of irreversible shear transformation zones (STZs) and a permanent uniform strain. The initiation of STZs is directly correlated with the atomic heterogeneity of the metallic glass and the accumulated permanent strain has a linear relation with the number of STZs. This study reveals a new deformation mode and offers insights into the atomic mechanisms of STZ formation and low temperature uniform plastic deformation of metallic glasses. |
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