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首页> 外文期刊>Materials Science and Engineering >Dependence of compressive deformation on pre-strain and loading direction in an extruded magnesium alloy: Texture, twinning and de-twinning
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Dependence of compressive deformation on pre-strain and loading direction in an extruded magnesium alloy: Texture, twinning and de-twinning

机译：挤压镁合金中压缩变形对预应变和载荷方向的依赖性：织构，孪生和孪生

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摘要

This study was aimed at identifying compressive deformation behavior of an extruded AM30 magnesium alloy after different amounts of pre-strain along the extrusion direction (ED), with focus on the effect of re-loading direction, texture evolution, and deformation mechanisms. Compressive loading in both ED and transverse direction (TD) resulted in a similar sigmoidal true stress-true strain behavior due to the presence of two sets of basal textures with c-axes aligned nearly parallel to the plate normal direction which facilitated the occurrence of {1012} extension twinning. In the two-step ED-ED compression, the compressive yield strength (YS) linearly increased, while the ultimate compressive strength (UCS) and hardening capacity linearly decreased with increasing pre-strain. The disappearance of twin boundaries or the coalescence of twins via twin growth was observed, but the twin boundaries were more visible and the intensity of cumulative textures with c-axes rotating towards the anti-compression direction was lower, in comparison with the one-step continuous compression at an equivalent strain level. In the two-step ED-TD compression, both YS and UCS increased, and hardening capacity decreased with increasing pre-strain. After a 4.0% pre-strain along the ED plus 4.0% re-compression along the TD, two seemingly opposite phenomena, i.e., the formation of new twins and de-twinning were observed to be co-existent due to the presence of multiple sets of textures after the first-step pre-straining. Both the reversal of textures and microstructural examinations corroborated the occurrence of de-twinning or twin narrowing/shortening as a result of the change of deformation path in the second-step compression.
机译：这项研究旨在确定挤压后的AM30镁合金在沿挤压方向（ED）施加不同量的预应变后的压缩变形行为，重点研究再加载方向，织构演变和变形机理的影响。 ED和横向（TD）上的压缩载荷都导致了相似的S型真实应力-真实应变行为，这是由于存在两组基础纹理，其c轴几乎平行于板法线方向对齐，从而促进了{ 1012}分机孪生。在两步ED-ED压缩中，抗压屈服强度（YS）线性增加，而最终抗压强度（UCS）和硬化能力随预应变的增加线性降低。与一步法相比，观察到孪晶边界的消失或孪晶通过孪晶生长的结合，但孪晶边界更明显，并且c轴朝着抗压方向旋转时的累积纹理强度更低。在等效应变水平下连续压缩。在两步ED-TD压缩中，YS和UCS均增加，并且硬化能力随预应变的增加而降低。在沿ED进行4.0％的预应变加上沿TD进行4.0％的再压缩之后，由于存在多个集合，因此观察到两种看似相反的现象同时存在，即形成新的双胞胎和发生孪生现象第一步预拉伸后的纹理集。在第二步压缩过程中，变形路径的​​改变导致结构的逆转和微观结构检查都证实了发生孪晶或孪生缩窄。

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  • 来源
    《Materials Science and Engineering》 |2014年第24期|134-144|共11页
  • 作者

    D. Sarker; D.L. Chen;

  • 作者单位

    Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada;

    Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada;

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  • 正文语种 eng
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  • 关键词

    Magnesium alloy; Pre-strain; Twinning; De-twinning; Texture;

    机译：镁合金预应变孪生;去缠绕质地;

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