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
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.
收稿日期: 2015-09-15
出版日期: 2016-02-26
:
62.20.F-
(Deformation and plasticity)
81.05.Bx
(Metals, semimetals, and alloys)
81.40.Cd
(Solid solution hardening, precipitation hardening, and dispersion hardening; aging)
[1] Zhao S T, Meng C L, Mao F X, Hu W P and Gottstein G 2014 Acta Mater. 76 54 2015 Measurement 72 61 2013 Mater. Sci. Eng. A 564 303 2009 Chin. Phys. B 18 3500 1988 Acta Metall. 36 3061 2004 Acta Mater. 52 3447 2006 Nat. Mater. 5 875 1990 Acta Metall. Mater. 38 697 1972 Acta Metall. 20 351 1997 Acta Mater. 45 3695 2010 Mater. Sci. Eng. A 527 5175 2012 Comput. Mater. Sci. 52 68 2011 Scr. Mater. 65 528 2011 Scr. Mater. 64 502 2012 Acta Mater. 60 6650 1998 Phys. Status Solidi A 170 63 1980 Acta Metall. 28 939 2012 Acta Mater. 60 1647
[1]
.
[2]
.
[3]
.
[4]
.
[5]
.
[6]
.
[7]
.
[8]
.
[9]
.
[10]
.
[11]
.
[12]
.
[13]
.
[14]
.
[15]
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