Effect of Ti-Si-Mg-Al wire on microstructure and mechanical properties of plasma arc in-situ welded joint of SiC_p/Al composites  

Ti-Si-Mg-Al焊丝对SiC_p/Al基复合材料等离子弧原位焊接焊缝组织和性能的影响(英文)

作　　者：雷玉成[1,2] 薛厚禄[1] 胡文祥[1] 闫久春[2] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第2期305-311,共7页中国有色金属学报（英文版）

基　　金：Project (09003) supported by the Open-Fund Research of State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,China;Project (JD0805) supported by the Science and Technology Innovation Team,Jiangsu University,China

摘　　要：The influence of Ti-Si-Mg-AI wire on microstructure and mechanical properties of SiCp/A1 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-A1 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 ofneedie-like harmful phase A14C3 is effectively inhibited and the wettability of molten pool is improved by adding Ti-Si-Mg-A1 flux-cored wires. With 15Ti-5Si-5Mg-A1 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.研究Ti-Si-Mg-Al焊丝对等离子弧原位合金化焊接制备SiC颗粒/铝金属基复合材料的微观结构和力学性能的影响。以氩氮混合气体为离子气,采用Ti-Si-Mg-Al药芯焊丝作为填充材料,对焊接接头进行拉伸试验,并对宏观形态和微观组织进行分析。结果表明:以Ti-Si-Mg-Al药芯焊丝作为原位反应填充材料,可以有效抑制针状脆性相Al4C3的生成。以15Ti-5Si-5Mg-Al药芯焊丝作为填充材料时,焊接接头的最大抗拉强度为267MPa,达到退火条件下基体材料强度的83%。

关 键 词：plasma arc in-situ welding aluminium matrix composites Ti-Si-Mg-A1 flux-cored wire 

分 类 号：TG456.2[金属学及工艺—焊接]