期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 50, 期 7, 页码 2185-2202出版社
ELSEVIER
DOI: 10.1016/j.commatsci.2011.02.030
关键词
Crystal plasticity; Deformation twinning; HCP metals
资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- General Motors of Canada Ltd.
- MagNET (NSERC Magnesium Strategic Network)
A new rate-dependent elastic-viscoplastic crystal plasticity constitutive model (CPCM) to simulate the large strain deformation in magnesium alloys is presented. The observed intragranular plastic deformation mechanisms of primary extension, primary contraction, and secondary extension (double) twinning are accounted for. The basal and non-basal slip systems in the parent grain, primary and double twins were also incorporated in the model. The crystallographic planes and directions of various slip and twinning systems are calculated. The slip-induced shear in the parent grain, as well as primary and secondary twinned regions are simulated. The twinning-induced shear from the primary and secondary twinned regions are also computed. In the model the texture evolution in the parent, as well as primary and secondary twinned regions are tracked. Separate resistance evolution functions for all the slip and twinning systems were considered. The interactions between various slip and twinning systems are accounted for in a comprehensive manner. Using the proposed CPCM, the plastic deformation in a magnesium single crystal in simple shear strain path is simulated. The contributions of various plastic deformation mechanisms to the macroscopic plastic deformation of the magnesium single crystal in this strain path are presented. The importance of identifying the active plastic deformation in a given strain path on a magnesium single crystal for a reliable model prediction was shown with an example. (C) 2011 Elsevier B.V. All rights reserved.
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