Ti-Al-Si-Mg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  

Influence of Ti-Al-Si-Mg on microstructures and mechanical properties of plasma arc in-suit welded joint of SiC_p/Al MMCs

作　　者：雷玉成[1,2] 胡文祥[1] 薛厚禄[1] 闫久春[2] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2011年第5期9-12,113,共4页Transactions of The China Welding Institution

基　　金：哈尔滨工业大学现代焊接生产技术国家重点实验室开放基金课题(09003);江苏科技大学先进焊接技术省级重点开放研究基金课题(JSAWT-0903);江苏大学科技创新团队资助项目(JD0805)

摘　　要：以填充自制药芯铝焊丝的形式向熔池内部直接添加Ti,Al,Si,Mg等金属元素,用氩氮混合等离子气体对SiCp/Al基复合材料进行等离子弧原位焊接.分析了Ti-Al-Si-Mg以及它们的氧化物对焊缝组织和性能的影响.结果表明,以Ti-Al-Si-Mg作为原位反应填充材料,可以有效抑制针状脆生相Al4C3的生成,改善熔池流动性,增加熔池内部金属的润湿性.形成了稳定的熔池,得到了以TiN,AlN,TiC,MgAl2O4和细小棒状的Al3Ti等为增强相的焊缝.焊缝组织致密结合良好,其最大抗拉强度为267 MPa.The influences of Ti-Al-Si-Mg and its oxides on microstructures and mechanical properties of SiCp/Al MMCs joints welded by plasma arc in-suit welding were investigated,in which argon-nitrogen mixture was used as plasma gases and Ti-Al-Si-Mg flux-cored wire as filled composites.The results show that the formation of needle-like harmful phases Al4C3 is effectively inhibited by adding Ti-Al-Si-Mg flux-cored wire as filler.The fluidity and wettability of molten pool is improved and the stable molten pool is obtained.The mechanical properties of welded joint are effectively enhanced by the compact-grain structure and the new reinforced composites such as TiN,AlN,TiC,MgAl2O4 and fine grain Al3Ti.The test results of mechanical properties show that the maximum tensile strength of welded joint with Ti-Al-Si-Mg flux-cored wire as filled composite reach up to 267 MPa.

关 键 词：复合材料 SiCp/Al基 等离子弧 原位焊接 Ti-Al-Si-Mg 

分 类 号：TG115.28[金属学及工艺—物理冶金]