Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 68, Issue -, Pages 111-131Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2014.12.001
Keywords
Twinning; Microstructures; Polycrystalline material; Mechanical testing; EBSD
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2013R1A1A2010247]
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The mechanical responses and deformation mechanisms of AZ31 Mg alloy sheets were studied under dynamic (tension and compression) and simple shear deformations along different in-plane loading directions. This paper is a continuation of the author's previous manuscript (Khan et al., 2011) on the quasi-static responses and texture evolution of AZ31 Mg alloy sheets. The strain-hardening rate (d sigma/d epsilon) of specimens under in-plane dynamic compression at room temperature showed a strong strain-rate dependency when deformation entered the dynamic region. The electron back-scattered diffraction (EBSD) technique was used to conduct texture analysis on each specimen after simple shear deformation under a quasi-static load (10(0) s(-1)) at 150 degrees C and after dynamic compression under a strain rate of 1500 s-1 at RT and 150 degrees C. Loading direction during simple shear deformation did not significantly affect either the texture evolution or the twinning evolution. Deformation temperature during dynamic compression affected both the texture evolution and the twinning evolution only slightly, but it significantly affected the kernel average misorientation (KAM) distribution in deformed grains. A visco-plastic self-consistent (VPSC) polycrystal model was successfully used to simulate the mechanical responses and the evolution of the initial texture in an AZ31 Mg alloy sheet during simple shear deformation and dynamic compression. (C) 2014 Elsevier Ltd. All rights reserved.
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