材料科学
打滑(空气动力学)
晶体孪晶
之字形的
极限抗拉强度
位错
镁合金
各向异性
滑倒
镁
部分位错
合金
结晶学
复合材料
凝聚态物理
冶金
几何学
微观结构
化学
光学
热力学
物理
数学
作者
Yuzhi Zhu,Dewen Hou,Kaixuan Chen,Zidong Wang
标识
DOI:10.1016/j.jma.2022.07.003
摘要
Textured magnesium alloys usually exhibit anisotropic mechanical behavior due to the asymmetric activation of different twinning and slipping modes. This work focuses on the pyramidal slip responses of rolled AZ31 magnesium alloy under two loading conditions, compressive and tensile loading along the normal direction. Under the condition where the compressive loading direction is closely parallel to the c-axis of the unit cell, tensile twinning and basal slips are prohibited, dislocations then active and tend to accumulate at grain boundaries and form dislocation walls. Meanwhile, these dislocations exhibit zigzag morphologies, which result from the cross-slip from {101¯1} first-order pyramidal plane to {112¯2} second-order pyramidal plane, then back to {101¯1} first-order pyramidal plane. Under the condition where tensile twins are prevalent, {101¯1} first-order and {112¯2} second-order pyramidal dislocations are favorable to be activated. Both types of dislocations behave climb-like dissociations onto the basal plane, forming zigzag dislocations.
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