中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 2 February 2012 |
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）
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
