(江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212013)
摘 要: 以不同Ti含量的Ti-Al合金作為合金化填加材料，采用氮氬混合等離子氣體對SiCp/6061Al復(fù)合材料進行等離子弧原位焊接，研究填加材料Ti-Al中Ti質(zhì)量分數(shù)的變化對焊縫組織的影響。結(jié)果表明：在熔池凝固過程中，填加材料中Ti質(zhì)量分數(shù)為10%時，可有效抑制有害針狀相Al4C3的生成；隨填加材料中Ti質(zhì)量分數(shù)的降低，焊縫中未出現(xiàn)脆性相Al4C3，組織中顆粒相的形貌發(fā)生較大變化，Al3Ti相的形狀由粗大塊狀變?yōu)榧氶L針狀，并且數(shù)量大為減少；焊縫中其余增強相的尺寸均變得較為細小。
關(guān)鍵字: SiCp/Al復(fù)合材料；Ti-Al合金；等離子弧；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
