Microstructure Evolution of Hot Rolled AZ61 Magnesium Alloy Strip

Xu Guangming1; Wang Donggang2; Cui Jianzhong1

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Microstructure Evolution of Hot Rolled AZ61 Magnesium Alloy Strip
Vol. 29, Issue 2, Pages: 115-117(2009)
Published： 2009 ，
DOI：

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[1]许光明,王栋刚,崔建忠.热轧工艺对AZ61镁合金铸轧板显微组织的影响[J].特种铸造及有色合金,2009,29(02):115-117+92.

Xu Guangming1, Wang Donggang2, Cui Jianzhong1. Microstructure Evolution of Hot Rolled AZ61 Magnesium Alloy Strip. [J]. Special Casting & Nonferrous Alloys 29(2):115-117(2009)
[1]许光明,王栋刚,崔建忠.热轧工艺对AZ61镁合金铸轧板显微组织的影响[J].特种铸造及有色合金,2009,29(02):115-117+92. DOI：

Xu Guangming1, Wang Donggang2, Cui Jianzhong1. Microstructure Evolution of Hot Rolled AZ61 Magnesium Alloy Strip. [J]. Special Casting & Nonferrous Alloys 29(2):115-117(2009) DOI：

摘要

通过研究不同温度下AZ61镁合金铸轧板坯的再加工性能

发现铸轧AZ61镁合金板坯在400、350℃时极限再加工变形量大于80%

而在300℃时减小到60%左右

在250℃时其极限再加工压下量下降到40%左右

200℃时进一步降低到20%～30%之间

在室温下极限压下量仅为10%左右。而从变形组织来看

在极限变形压下量范围内

冷轧微观组织与原始态的没有本质区别;200℃时轧制晶粒明显伸长

呈纤维状;在高于250℃轧制时

晶粒明显细化;在400℃轧制时

晶粒细化效果显著

晶粒平均尺寸达到5μm左右。

Abstract

Effects of different temperature on re-deforming rate of cast-rolling AZ61 magnesium alloy strip were examined.The results reveal that the ultimate re-deforming rate of magnesium strip is more than 80% at 400℃ and 350℃

while it reaches 60% at 300℃ and it falls to about 40% at 250℃

furthermore

it drops down to 20%～30% at 200℃ and only 10% at room temperature.Deformed structure observation reveals that microstructure of cold rolled alloy is substantially similar to that of cast-rolling ones in range of ultimate re-deforming rate.Grain in rolled alloy at 200℃ exists in fibrous structure due to being elongated

and grain size can be evidently refined with rolling at more than 250℃.Grain with approximately 5μm in average size can be observed with rolling at 400℃.