Effect of Ti−Si−Mg−Al wire on microstructure and
mechanical properties of plasma arc in-situ welded joint of SiCp/Al composites
mechanical properties of plasma arc in-situ welded joint of SiCp/Al composites
(1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China)
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The influence of Ti−Si−Mg−Al wire on microstructure and mechanical properties of SiCp/Al metal matrix composite joints produced by plasma arc in-situ weld-alloying was investigated. Argon-nitrogen mixture was used as plasma gas and Ti−Si−Mg−Al flux-cored wires as filled composites. Weldments were submitted to tensile test. Meanwhile, the macro morphology and microstructure of the joints were examined. The result shows that the formation of needle-like harmful phase Al4C3 is effectively inhibited and the wettability of molten pool is improved by adding Ti−Si−Mg−Al flux-cored wires. With 15Ti−5Si−5Mg−Al flux-cored wire as filled composite, the maximum tensile strength of the welded joint is 267 MPa, which is up to 83% that of the matrix composites under annealed condition.
Key words: plasma arc; in-situ welding; aluminium matrix composites; Ti−Si−Mg−Al flux-cored wire