Influence of pre-recovery on the subsequent recrystallization and mechanical properties of a twin-roll cast Al-Mn alloy

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• 作者：Li Huang ; Guangjie Huang ; ^{gjhuang@cqu.edu.cn} ; Lingfei Cao ; ^{caolingfei@cqu.edu.cn} ; Xiaodong Wu ; Zhihong Jia ; Mingyong Xia ; Qing Liu ; ^{qingliu@cqu.edu.cn}
• 关键词：Aluminum alloys ; Recrystallization ; Nucleation ; Pre-recovery ; Grain refinement ; Anisotropy
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：63-72
• 全文大小：2564 K
• 卷排序：682

文摘

A two-step annealing treatment consisting of a pre-recovery process (450 °C/5 h) and a following recrystallization process (530 °C/15 h) was developed for a cold-rolled twin-roll cast 3003 alloy (Al-1.13Mn-0.45Fe-0.1Si in wt%) sheet. The effects of pre-recovery on recrystallization behavior and mechanical properties were systematically studied. Our results show that fine quasi-equiaxed grains together with very weak ND-rotated cube (001) <310> texture was successfully obtained using the proposed two-step annealing treatment. It is found that pre-recovery stimulates the formation of precipitates-free zones around constituent particles. Within such precipitates-free zones, substantial random oriented sub-grains can readily grow to critical size for nucleation, which contribute to enhanced nucleation without preferential orientation. This is the reason for the formation of fine grains as well as a weak texture in the two-step annealed sheet. The sheets that were subject to this two-step annealing also exhibits an extremely weak mechanical anisotropy with a Δr value 0.03, much lower than that of sample (0.31) subjected to a single-step annealing at 530 °C for 15 h.