Theory of Pressure-Induced Rejuvenation and Strain Hardening in Metallic Glasses
We theoretically investigate high-pressure effects on the atomic dynamics of metallic glasses. The theory predicts compression-induced rejuvenation and the resulting strain hardening that have been recently observed in metallic glasses. Structural relaxation under pressure is mainly governed by loca...
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| Tác giả chính: | , , , |
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| Định dạng: | Bài trích |
| Ngôn ngữ: | eng |
| Nhà xuất bản: |
PHYSICAL REVIEW LETTERS
2021
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| Truy cập trực tuyến: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.025502 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2827 https://doi.org/10.1103/PhysRevLett.126.025502 |
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| Tóm tắt: | We theoretically investigate high-pressure effects on the atomic dynamics of metallic glasses. The theory predicts compression-induced rejuvenation and the resulting strain hardening that have been recently observed in metallic glasses. Structural relaxation under pressure is mainly governed by local cage dynamics. The external pressure restricts the dynamical constraints and slows down the atomic mobility. In addition, the compression induces a rejuvenated metastable state (local minimum) at a higher energy in the free-energy landscape. Thus, compressed metallic glasses can rejuvenate and the corresponding relaxation is reversible. This behavior leads to strain hardening in mechanical deformation experiments. Theoretical predictions agree well with experiments. |
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