摘要
采用锥台结构搅拌针对7075-T651铝合金实施搅拌摩擦焊,并进行了背部二次补焊和不同温度的固溶热处理,对焊态接头的力学性能进行了研究。结果表明,二次焊接可提高接头的综合力学性能;热处理可提高焊头硬度,但强度和伸长率有所下降,且随着热处理温度的升高,裂纹沿"S"线扩展,导致晶粒异常长大。
The friction stir welding of 7075-T651 aluminum alloy was carried out using the frustum structure stir needle, and the second welding on back and the solution heat treatment at different temperatures were conducted, the mechanical properties of welded joints were studied. The results show that the second welding can improve the mechanical properties of joints, and heat treatment can increase the hardness, but the strength and elongation is decrease. As the annealing temperature rises, the cracks happen expand along the ＂S＂ line, and lead to the abnormal grain growth.
出处
《铸造技术》
CAS
北大核心
2014年第3期577-579,共3页
Foundry Technology
基金
河南省科技厅重点科研项目资助(豫科鉴字【2013】第1725号)
关键词
搅拌摩擦焊
铝合金
热处理
力学性能
friction stir welding
aluminum alloy
heat treatment
mechanical properties
