期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 53, 期 -, 页码 107-124出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2013.07.008
关键词
Cyclic deformation; Magnesium alloy; Ratcheting
资金
- Natural Science Foundation of China [51275472]
- Science and Technology Department of Zhejiang Province [2012C21101]
- Natural Science Foundation of Zhejiang Province [LY12E05024]
- US Department of Energy, Office of Basic Energy Sciences [DE-SC0002144]
To experimentally study the role of the twinning/detwinning process in cyclic plastic deformation of Mg alloys, both strain-controlled and stress-controlled cyclic tension-compression experiments were conducted using extruded ZR60 magnesium (Mg) alloy in ambient air. The fully revered strain-controlled experiments had strain amplitudes varying from 0.25% to 4%. Three types of cyclic deformation are identified in light of the involvement of twinning/detwinning. The stress-controlled experiments reveal the cyclic ratcheting behavior of the material. Due to a strong basal texture of the material, no sustainable twinning/detwinning deformation occurs when the stress level is below the twinning or detwinning yield stress. As a result, ratcheting deformation under certain loading conditions is dominated by dislocation slip and is similar to that of other metallic materials. Cyclic twinning and detwinning in a stress-controlled experiment result in significant cyclic hardening. Under stress-controlled loading condition when ratcheting deformation occurs, the ratcheting rate decays with increasing number of loading cycles following a power law fashion regardless of the deformation mechanisms. Strain ratcheting is discussed for deformation involving the twinning/detwinning process and the experimental observations are explained in light of the micromechanisms. (C) 2013 Elsevier Ltd. All rights reserved.
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