Role of grain boundary segregation on microstructural development in basal-textured Mg-Al-Zn alloy sheet
Role of grain boundary segregation on microstructural development in basal-textured Mg-Al-Zn alloy sheet
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DOI：
10.1016/j.scriptamat.2022.114828
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发表时间：
2022
影响因子：
6
通讯作者：
T. Nakata;Z.H. Li;T. Sasaki;K. Hono;S. Kamado
中科院分区：
文献类型：
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作者：
T. Nakata;Z.H. Li;T. Sasaki;K. Hono;S. Kamado
我们报道了 Mg-3Al-0.8Zn-0.4Mn（质量％，AZ31）合金热轧过程中晶界偏析对显微组织发展的作用。热轧前 420°C 的退火会引起 Al 和 Zn 的强烈晶界偏析，在晶界附近形成薄的溶质贫化区域。这有利于晶界处的动态再结晶并产生强的基底织构。另一方面，500℃退火减少了晶界偏析，阻碍了热轧过程中的动态再结晶。结果，在随后的退火过程中出现弱的轧制方向分裂织构，这提高了AZ31合金板的拉伸成形性。
We report the role of grain boundary segregation on microstructure development during hot-rolling of Mg-3Al-0.8Zn-0.4Mn (mass%, AZ31) alloy. Annealing at 420 °C before hot-rolling induces strong grain boundary segregation of Al and Zn, forming thin solute-depleted regions near the grain boundaries. This facilitates dynamic recrystallization at the grain boundaries and induces strong basal texture. On the other hand, annealing at 500 °C reduces the grain boundary segregation, hindering the dynamic recrystallization during hot-rolling. As a result, a weak rolling-direction-split texture occurs during subsequent annealing, and this improves the stretch formability of the AZ31 alloy sheet.