Twinning and mechanical behavior of an extruded Mg–6Al–3Sn alloy with a dual basal texture
Twinning and mechanical behavior of an extruded Mg–6Al–3Sn alloy with a dual basal texture
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DOI：
10.1016/j.msea.2013.04.026
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发表时间：
2013-08
期刊：
影响因子：
6.4
通讯作者：
Lei Zhang;C. Liu;Huiyuan Wang;X. Nan;Wei Xiao;Q. Jiang
中科院分区：
文献类型：
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作者：
Lei Zhang;C. Liu;Huiyuan Wang;X. Nan;Wei Xiao;Q. Jiang
对具有双重基面织构的挤压Mg-6Al-3Sn（AT 63）合金进行了沿着挤压方向（艾德）、横向（TD）和法向（ND）的单轴压缩试验。不同于轧制镁合金中常见的单基底织构，其在一次压缩中有利于伸展或收缩孪晶，双基底织构欣赏伸展和收缩孪晶。然而，拉伸和收缩孪生显示出不同的活动在三个压缩。结果表明，拉伸孪晶在艾德压缩时主要传播，而在TD和ND压缩时传播有限，尽管在这三种压缩下，拉伸孪晶都在塑性开始时成核。相反，收缩孪生成核早，广泛TD和ND压缩，而它在很大程度上抑制艾德压缩。拉伸孪晶和迟缩孪晶的扩展导致艾德压缩应变硬化曲线的峰值和下降幅度较大。研究结果对多织构镁合金的变形机制有一定的指导意义。
Uniaxial compression tests were performed on an extruded Mg–6Al–3Sn (AT63) alloy with a dual basal texture, along the extrusion direction (ED), transverse direction (TD) and normal direction (ND). Unlike the single basal texture commonly seen in rolled Mg alloys, for which either extension or contraction twinning is favored in one compression, the dual basal texture appreciates both extension and contraction twinning. Nevertheless extension and contraction twinning display different activities among the three compressions. The results suggest that extension twinning propagates largely for ED compression while it displays limited propagations for TD and ND compressions, although it nucleates at the onset of plasticity for all the three compressions. In contrast, contraction twinning nucleates early and widely for TD and ND compressions while it is largely suppressed for ED compression. It is the wider propagations of extension twinning and belated contraction twinning that result in a larger drop and a higher peak in the strain hardening curve for ED compression. Our results shed some light on deformation mechanisms of the Mg alloys consisting of multiple texture components.