(江苏大学 材料科学与工程学院，镇江 212013)
摘 要: 以不同Ti含量的Ti-Al合金作为合金化填加材料，采用氮氩混合等离子气体对SiCp/6061Al复合材料进行等离子弧原位焊接，研究填加材料Ti-Al中Ti质量分数的变化对焊缝组织的影响。结果表明：在熔池凝固过程中，填加材料中Ti质量分数为10%时，可有效抑制有害针状相Al4C3的生成；随填加材料中Ti质量分数的降低，焊缝中未出现脆性相Al4C3，组织中颗粒相的形貌发生较大变化，Al3Ti相的形状由粗大块状变为细长针状，并且数量大为减少；焊缝中其余增强相的尺寸均变得较为细小。
关键字: SiCp/Al复合材料；Ti-Al合金；等离子弧；原位焊接
（School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China）
Abstract: The effect of the content variation of titanium in Ti-Al alloy on microstructures of weld of SiCp/6061Al MMC was investigated. The weld was produced by plasma arc ‘in-situ’ weld-alloying welding, argon-nitrogen mixture as plasma gases and Ti-Al alloy as filled composite. The results indicate that when the mass fraction of titanium is 10% in Ti-Al alloy sheet filler, the formation of needle-like harmful phases Al4C3 is effectively prevented during the solidification process of molten pool. With decreasing titanium content in Ti-Al alloy, the morphology of particles changes greatly. The number of phases in microstructures decreases, and the particle morphology of phase Al3Ti changes from massive block to short rod-like shape.
Key words: SiCp/Al composite material; Ti-Al alloy; plasma arc; ‘in-situ’ welding
