| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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The Mechanism of Critical Strain of Serrated Yielding in Strain Rate Domain |
| Shi-Hua Fu, Yu-Long Cai, Su-Li Yang, Qing-Chuan Zhang**, Xiao-Ping Wu |
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027
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| Cite this article: |
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Shi-Hua Fu, Yu-Long Cai, Su-Li Yang et al 2016 Chin. Phys. Lett. 33 026201 |
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Abstract The mechanism of the critical strain of serrated yielding is studied via tension tests at various strain rates. Before the critical strain, it is deduced that dislocations are not pinned at high strain rates, and dislocations at low strain rates are pinned but cannot escape. The critical strain depends on the first pinning process at high strain rates and on the first unpinning process at low strain rates. The calculated results based on the two criteria are in good consistency with the experiment.
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Received: 15 September 2015
Published: 26 February 2016
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| PACS: |
62.20.F-
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(Deformation and plasticity)
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81.05.Bx
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(Metals, semimetals, and alloys)
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81.40.Cd
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(Solid solution hardening, precipitation hardening, and dispersion hardening; aging)
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