摘要
对厚度6 mm的AZ91D镁合金搅拌摩擦焊接头热处理前后的焊缝微观组织和静态再结晶动力学进行研究。结果表明:热处理后,AZ91D接头焊核区组织发生了静态再结晶,等轴晶组织明显细化,β-Mg_(17)Al_(12)相在焊核区的分布由原来的团簇状变为细小弥散的短棒或点状,且含量减少。AZ91D接头焊核区再结晶激活能为42.6 k J/mol,在300、350、400和450℃退火条件下,接头焊核区发生完全再结晶的时间分别为75、37.5、25和15 min。
The microstructure and static recrystallization before and after heat treatment of friction stir welded 6 mm AZ91 D magnesium alloy were investigated. The results show that the crystal grains become small and uniform at the typical friction stir weld joint zone after heat treatment. The β- Mg（17）Al（12） phase turns from sporadic cluster into short rod or dot. The activation energy was calculated to be about 42.6 k J/mol, the time for recrystallization completion at 300, 350,400 and 450 ℃ are 75、37.5、25 and 15 min respectively.
出处
《铸造技术》
CAS
北大核心
2017年第1期60-64,共5页
Foundry Technology
基金
广东省科技厅科技计划资助项目(2014B030 301012)
广州市对外科技合作专项资助项目(2013J4500066)
广州市科技计划资助项目(201509010 003)
广东省金属强韧化技术与应用重点实验室资助项目(2014B030301012)
关键词
AZ91D镁合金
搅拌摩擦焊
微观组织
再结晶动力学
AZ91D magnesium alloy
friction stir welding
microstructure
recrystallization kinetics
