In-situ observation of twinning and detwinning in AZ31 alloy

晶体孪晶 材料科学 成核 电子背散射衍射 打滑(空气动力学) 体积分数 复合材料 加工硬化 位错 变形(气象学) 合金 冶金 凝聚态物理 结晶学 微观结构 热力学 物理 化学
作者
Wu Gong,Ruixiao Zheng,Stefanus Harjo,Takuro Kawasaki,Kazuya Aizawa,Nobuhiro Tsuji
出处
期刊:Journal of Magnesium and Alloys [Elsevier BV]
卷期号:10 (12): 3418-3432 被引量:34
标识
DOI:10.1016/j.jma.2022.02.002
摘要

Twinning and detwinning behavior of a commercial AZ31 magnesium alloy during cyclic compression–tension deformation with a total strain amplitude of 4% (±2%) was evaluated using the complementary techniques of in-situ neutron diffraction, identical area electron backscatter diffraction, and transmission electron microscopy. In-situ neutron diffraction demonstrates that the compressive deformation was dominated by twin nucleation, twin growth, and basal slip, while detwinning dominated the unloading of compressive stresses and subsequent tension stage. With increasing number of cycles from one to eight: the volume fraction of twins at -2% strain gradually increased from 26.3% to 43.5%; the residual twins were present after 2% tension stage and their volume fraction increased from zero to 3.7% as well as a significant increase in their number; and the twinning spread from coarse grains to fine grains involving more grains for twinning. The increase in volume fraction and number of residual twins led to a transition from twin nucleation to twin growth, resulting in a decrease in yield strength of compression deformation with increasing cycles. A large number of -component dislocations observed in twins and the detwinned regions were attributed to the dislocation transmutation during the twinning and detwinning. The accumulation of barriers including twin boundaries and various types of dislocations enhanced the interactions of migrating twin boundary with these barriers during twinning and detwinning, which is considered to be the origin for increasing the work hardening rate in cyclic deformation of the AZ31 alloy.
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