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Electron beam welding of SiCp/2024 and 2219 aluminum alloy
陈国庆, 张秉刚, 杨勇, 冯吉才
作者单位
陈国庆, 张秉刚, 杨勇, 冯吉才 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China 
摘要:
SiCp/2024 matrix composites reinforced with SiC particles and 2219 aluminum alloy were joined via centered electron beam welding and deflection beam welding, respectively, and the microstructures and mechanical properties of these joints were investigated. The results revealed that SiC particle segregation was more likely during centered electron beam welding (than during deflection beam welding), and strong interface reactions led to the formation of many Al4C3 brittle intermetallic compounds. Moreover, the tensile strength of the joints was 104 MPa. The interface reaction was restrained via deflection electron beam welding, and only a few Al4C3 intermetallic compounds formed at the top of the joint and heat affected zone of SiCp/Al. Quasi-cleavage fracture occurred at the interface reaction layer of the base metal. Both methods yielded a hardness transition zone near the SiCp/2024 fusion zone,and the brittle intermetallic Al4C3compounds formed in this zone resulted in high hardness.
关键词:  SiCp/2024 matrix composite|2219 aluminum alloy|electron beam welding|microstructure|mechanical properties
DOI:10.12073/j.cw.20190713002
分类号:
基金项目:
Electron beam welding of SiCp/2024 and 2219 aluminum alloy
Guoqing Chen, Binggang Zhang, Yong Yang, Jicai Feng
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Abstract:
SiCp/2024 matrix composites reinforced with SiC particles and 2219 aluminum alloy were joined via centered electron beam welding and deflection beam welding, respectively, and the microstructures and mechanical properties of these joints were investigated. The results revealed that SiC particle segregation was more likely during centered electron beam welding (than during deflection beam welding), and strong interface reactions led to the formation of many Al4C3 brittle intermetallic compounds. Moreover, the tensile strength of the joints was 104 MPa. The interface reaction was restrained via deflection electron beam welding, and only a few Al4C3 intermetallic compounds formed at the top of the joint and heat affected zone of SiCp/Al. Quasi-cleavage fracture occurred at the interface reaction layer of the base metal. Both methods yielded a hardness transition zone near the SiCp/2024 fusion zone,and the brittle intermetallic Al4C3compounds formed in this zone resulted in high hardness.
Key words:  SiCp/2024 matrix composite|2219 aluminum alloy|electron beam welding|microstructure|mechanical properties