Influence of deformation twinning on static annealing of AZ31 Mg alloy
Influence of deformation twinning on static annealing of AZ31 Mg alloy
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DOI：
10.1016/j.actamat.2013.06.037
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发表时间：
2013-09-01
期刊：
影响因子：
9.4
通讯作者：
Kalidindi, Surya R.
中科院分区：
文献类型：
--
作者：
Levinson, Amanda;Mishra, Raja K.;Kalidindi, Surya R.
研究了AZ31镁合金等温静态退火过程中的组织演变，以评价拉伸孪晶和收缩孪晶对室温变形后再结晶组织的贡献，并确定这些孪晶改变再结晶织构的可能性。观察到收缩孪晶是具有许多有利新取向的再结晶核的有效形核位置，而伸展孪晶不是再结晶的有效形核位置。虽然再结晶优先在收缩孪晶内部形核，产生了新的取向分布(远离不希望的c轴纤维织构)，但这些新的晶粒并没有显著影响最终的织构。这可归因于四个因素：(1)大部分晶粒在c轴压缩后再结晶开始前异常广泛的回复；(2)与起始纤维织构排列最紧密的晶粒内的不完全再结晶；(3)在压缩孪晶中形核的晶粒生长迟缓；(4)晶界成为再结晶核的活跃位置，其大部分包含从起始织构开始的取向。(C)2013 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
The microstructure evolution during isothermal static annealing of magnesium alloy AZ31 was investigated to critically evaluate the contribution of extension and contraction twins to the recrystallized microstructure after room temperature deformation, and to establish the potential of these twins to alter the recrystallized texture. Contraction twins were observed to be potent sites for recrystallized nuclei having many favorable new orientations, while extension twins were not effective nucleation sites for recrystallization. Although recrystallization nucleated preferentially inside the contraction twins, producing a distribution of new orientations (far from the undesirable starting c-axis fiber texture), these new grains did not significantly influence the final texture. This was attributed to four factors: (1) unusually extensive recovery before the onset of recrystallization after c-axis compression in most grains; (2) incomplete recrystallization within grains most closely aligned with the starting fiber texture; (3) sluggish growth of grains nucleated in the compression twins; (4) grain boundaries becoming an active site for recrystallized nuclei with a majority containing orientations from the starting texture. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.