Microstructure and mechanical properties of an asymmetric twin-roll cast AZ31 magnesium alloy strip

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• 作者：Hu Zhao^a ; ^b ; ^{h-zhao07@mails.tsinghua.edu.cn} ; Peijie Li^a ; ^b ; Liangju He^a
• 关键词：AZ31 magnesium alloy ; Asymmetric twin-roll casting ; Precipitates ; Recrystallization ; Mechanical properties
• 刊名：Journal of Materials Processing Technology
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：212
• 期：8
• 页码：1670-1675
• 全文大小：1935 K

文摘

The microstructure along the thickness of a strip produced by asymmetric twin-roll casting was found to be significantly inhomogeneous. There were many banded structures with flow form near the upper surface of the strip, whereas a fine dendritic structure dominated near the lower surface of the strip. Precipitates of Mg₁₇Al₁₂ and Al₈Mn₅ were dispersively distributed throughout the as-cast strip. Recrystallization of the strip during homogenization first occurred in the banded structures. After rolling and annealing, the strip consisted of fine grains measuring approximately 5 ¦Ìm in size. It was concluded that the shear strain caused by the difference in linear velocity between the surfaces of the upper and lower rolls resulted in the banded structures of the strip.