Microstructural evolution and superplasticity of rolled Mg-9Al-1Zn
Microstructural evolution and superplasticity of rolled Mg-9Al-1Zn
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DOI：
10.1016/s0921-5093(00)00959-x
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发表时间：
2000-10
期刊：
影响因子：
6.4
通讯作者：
T. Mohri;M. Mabuchi;M. Nakamura;T. Asahina;H. Iwasaki;T. Aizawa;K. Higashi
中科院分区：
文献类型：
--
作者：
T. Mohri;M. Mabuchi;M. Nakamura;T. Asahina;H. Iwasaki;T. Aizawa;K. Higashi
研究了673 K轧制Mg-9Al-1Zn合金在573 K和1.5×10−3s−1温度下的组织演变和超塑性。轧制态镁合金的晶粒尺寸为39.5 μm。而当真应变为0.6时，试样的晶粒尺寸为9.1 μm。晶粒细化归因于拉伸试验初期动态连续再结晶。在镁合金中实现动态连续再结晶不需要细颗粒稳定亚晶界和预先热变形刺激连续再结晶。由于晶粒细化，轧制镁合金表现出超塑性行为。
Microstructural evolution and superplasticity of a Mg-9Al-1Zn alloy rolled at 673 K were investigated at 573 K and 1.5×10−3s−1. The grain size of the as-rolled Mg alloy was 39.5 μm. However, the grain size of the specimen deformed to a true strain of 0.6 was 9.1 μm. The grain refinement was attributed to dynamically continuous recrystallization during an initial stage of tensile test. Stabilization of subgrain boundaries by fine particles and stimulation of continuous recrystallization by prior warm-deformation were not needed to attain dynamically continuous recrystallization in the Mg alloy. As a result of the grain refinement, the rolled Mg alloy exhibited superplastic behavior.