Texture weakening and static recrystallization in rolled Mg–2.9Y and Mg–2.9Zn solid solution alloys
Texture weakening and static recrystallization in rolled Mg–2.9Y and Mg–2.9Zn solid solution alloys
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DOI：
10.1007/s10853-012-6440-0
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发表时间：
2012-04
影响因子：
4.5
通讯作者：
S. A. Farzadfar;Ė. Martin;M. Sanjari;E. Essadiqi;S. Yue
中科院分区：
文献类型：
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作者：
S. A. Farzadfar;Ė. Martin;M. Sanjari;E. Essadiqi;S. Yue
研究了Mg-2.9Y和Mg-2.9Zn固溶体合金在轧制和随后的等温退火后的组织和织构演变。对Mg-2.9Y合金进行热轧，并在室温下对Mg-2.9Zn合金进行轧制，以评估通过抑制动态再结晶（DRX）和促进静态再结晶（SRX）来实现织构弱化的可能性。结果发现，即使在不存在Y的情况下，当没有动态再结晶时，Mg中也可以获得织构弱化，并且在退火期间发生SRX。在固溶态，Y抑制了热轧过程中的动态再结晶，延缓了镁的SRX和晶粒粗化动力学。在这两种合金中，静态再结晶晶粒在带/孪晶（TSRX晶粒）的取向接近于双孪晶和压缩孪晶的取向，表现出比基底母晶和孪晶更均匀分布和略宽的取向。在Mg-2.9Zn和Mg-2.9Y合金中，观察到随着SRX的进展，连续的织构弱化，这导致由小TSRX晶粒和较大的晶粒组成的双峰组织。在粗化过程中，随着晶粒尺寸的增加，基极图的最大强度呈线性上升，直线的斜率在两种合金中几乎相同。这种织构强化归因于较大的TSRX颗粒消耗了较小的TSRX颗粒。
The microstructure and texture evolution in the Mg–2.9Y and Mg–2.9Zn solid solution alloys were investigated following rolling and subsequent isothermal annealing. The Mg–2.9Y alloy was hot rolled, and the Mg–2.9Zn alloy was rolled at room temperature in order to evaluate the possibility of attaining texture weakening by the suppression of dynamic recrystallization (DRX) and promotion of static recrystallization (SRX). It was found that texture weakening can be attained in Mg even in the absence of Y when there is no DRX, and SRX occurs during annealing. In solid solution, Y suppresses DRX during hot rolling, and retards the kinetics of SRX and grain coarsening in Mg. In the two alloys, the orientation of statically recrystallized grains at bands/twins (TSRX grains) is close to that of double and compression twins, exhibiting a much more evenly distributed and slightly wider orientation than that of basal parent grains and twins. In both Mg–2.9Zn and Mg–2.9Y alloys, a continuous texture weakening is observed with the progress of SRX, which results in a bimodal microstructure consisting of small TSRX grains and larger ones. With the increase in grain size during coarsening, the maximum intensity of basal pole figures rises linearly, with the slope of the lines being nearly identical in the two alloys. This texture strengthening was ascribed to the consumption of small TSRX grains by larger ones.