摘要
对6063-3A21异种铝合金搅拌摩擦焊接头和焊后经T6热处理的接头显微组织和析出相进行了观察,并测量了接头硬度分布。结果表明,经搅拌摩擦焊后,焊核区材料组织得到细化,析出相被搅碎并弥散分布;T6热处理使6063铝合金侧的析出相进一步细化。反映在硬度上,搅拌摩擦过程使6063铝合金侧的硬度增加,T6处理后进一步提高;较高的焊接速度导致6063-O铝合金侧硬度下降,但是接头的硬度都较母材的有所提高,而3A21铝合金侧焊缝区硬度比母材的低;搅拌头转速提高会导致晶粒的长大,硬度降低。
Microstructure, precipitate and hardness of 6063-3A21 dissimilar friction stir welding joints and welding joints after T6 heat treatment were measured and analyzed. The re- sults showed that grain size of weld nugget became finer due to the friction stir processing, and precipitates were fragmentized and dispersed. The T6 heat treatment resulted in the fur- ther fined grain size of 6063 aluminum alloy. Hardness of 6063 aluminum alloy was improved as a result of friction stir welding, and increased more after the T6 heat treatment. High weld- ing speed decreased hardness of 6063-0 aluminum alloy. Compared with the hardness of par- ent material,hardness of the joints was still higher,while hardness of 3A21 aluminum alloy weld zone was lower. Raising rotating rate led to bigger grain size and lower hardness.
出处
《轻合金加工技术》
CAS
北大核心
2013年第10期59-63,共5页
Light Alloy Fabrication Technology
基金
"高档数控机床与基础制造装备"国家重大科技专项2012年度课题"铝合金关键结构摩擦点焊装备"(2012ZX04008011)
关键词
搅拌摩擦焊
显微组织
硬度
热处理
friction stir welding
microstructure
hardness
heat treatment
