2A97铝锂合金搅拌摩擦焊

基金项目: 国家自然科学基金资助项目(51105030);哈尔滨工业大学先进焊接与连接国家重点实验室资助项目(AWPT-M06);中央高校基本科研业务费专项资金资助

Study on friction stir welding of 2A97 Al-Li alloy

1.
School of Materials Science and Technology, University of Science and Technology Beijing, Beijing 100083, China;State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 100051, China
2.
Capital Aerospace Machinery Company, Beijing 100076, China
3.
State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 100051, China
4.
School of Materials Science and Technology, University of Science and Technology Beijing, Beijing 100083, China

摘要: 文中采用不同搅拌摩擦焊接工艺参数对2A97铝锂合金的可焊性进行了研究.结果显示,接头抗拉强度和断后伸长率随搅拌头转速的提高而降低,随焊接速度的提高先增后减.在旋转频率为600 r/min,焊接速度200 mm/min时接头抗拉强度最高达到373 MPa,为母材的69%.FSW接头拉伸试验断口位置基本都发生在焊核(NZ)区.焊核区和热力影响区中沉淀相大部分溶解,只有少数存留,热力影响区沉淀相密度高于焊核区.
- 铝锂合金 /
- 搅拌摩擦焊 /
- 微观组织 /
- 力学性能
Abstract: The weldability of 2A97 Al-Li alloy was studied using different friction stir welding variables in this paper.The results showed that the tensile strength and the elongation rate decreased with the increasing of the rotation speed.With the increasing of the welding speed,the tensile strength firstly increased to a maximum value then decreased.The maximum tensile strength was 373 MPa,which reached to 69% of that of the base metal,when the rotation speed was 600 r/min and the welding speed was 200 mm/min.The joints were mostly fractured at the weld nugget.Most of the precipitated phases in the weld nugget and the heat affected zone were decomposed.The precipitate density in the heat affected zone was higher than that in the weld nugget.
- Al-Li alloy /
- friction stir welding /
- microstructure /
- mechanical properties