Effects of Mn content on recrystallization resistance of AA6082 aluminum alloys during post-deformation annealing

• 作者: Xiaoming Qian Nick Parson X.-Grant Chen
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（17）
• 页码范围: 189-197
• 页数: 9页
• 语种: 英文

摘要

The microstructural evolutions under as-homogenized and as-deformed conditions and after the post-deformation annealing of AA6082 aluminum alloys with different Mn content (0.05 wt.％-1 wt.％) were studied by optical,scanning electron,and transmission electron microscopies.The results showed that the presence of a large amount of α-Al(Mn,Fe)Si dispersoids induced by Mn addition significantly improved the recrystallization resistance.In the base alloy free of Mn,static recrystallization occurred after 2 h of annealing,and grain growth commenced after 4 h of annealing,whereas in Mn-containing alloys,the recovered grain structure was well-retained after even 8 h of annealing.The alloy with 0.5％ Mn exhibited the best recrystallization resistance,and a further increase of the Mn levels to 1 ％ resulted in a gradual reduction of the recrystallization resistance,the reason for which was that recrystallization occurred only in the dispersoid-free zones (DFZs) and the increased DFZ fraction with Mn content led to an increase in the recrystallization fraction.The variation in the dispersoid number density and a coarsening of dispersoids during annealing have a limited influence on the static recrystallization in Mn-containing alloys.