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Title: Effect of twinning and detwinning on inelastic behavior during unloading in a magnesium alloy sheet
Authors: Hama, Takayuki  kyouindb  KAKEN_id
Kitamura, Naoya
Takuda, Hirohiko  kyouindb  KAKEN_id
Author's alias: 浜, 孝之
Keywords: Magnesium alloy sheet
Crystal plasticity
Finite element method
Issue Date: Oct-2013
Publisher: Elsevier B.V.
Journal title: Materials Science and Engineering: A
Volume: 583
Start page: 232
End page: 241
Abstract: We investigate the nonlinear response arising during unloading under in-plane uniaxial compression of a rolled magnesium alloy sheet using a crystal plasticity finite-element method, focusing on the effects of twinning and detwinning, and discuss the mechanism that causes the nonlinear response to be more pronounced under uniaxial compression than under uniaxial tension. In the simulation, we employed a twinning and detwinning model recently proposed by the authors. From numerical experiments, we confirmed that, as already noted in previous studies, detwinning activity plays an important role in the nonlinear response during unloading. However, we also found that the basal slip could become very active during unloading because of the dispersion of crystallographic orientations caused by twinning activity during loading, which is another factor in the pronounced nonlinear response during unloading under uniaxial compression. We conclude that the nonlinear response during unloading is more pronounced under uniaxial compression than under uniaxial tension because of these two factors--i.e., the detwinning activity and the pronounced basal slip activity--which are not present under uniaxial tension.
Rights: © 2013 Elsevier B.V.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1016/j.msea.2013.06.070
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