以铝-钛-镍-硅合金为填充材料,采用氩/氮混合等离子气体对SiC_p/6061Al基复合材料进行等离子弧原位焊接,研究了不同成分合金填料对焊接接头组织与性能的影响.结果表明:填充Al-10Ti-10Ni-3Si合金的焊缝组织均匀、致密,存在少量50μm长的针状相,熔合区Al_3Ti相数量较中心区的减少,无灰色针状Al_4C_3相;填充Al-5Ti-5Ni-5si合金的焊缝中增强相数量较前者的有所减少,并呈无序分布,同样也无针状相;焊缝由A1N、Al_3Ti、TiC、Ni_3Al、NiTi_2、Ti_5Si_3等相组成;两种接头的抗拉强度分别为215.0 MPa和221.5 MPa.
The effects of the filler alloys with different compositions on microstrueture and properties of SiC_p/6061Al matrix composite joints welded by plasma arc welding with argon-nitrogen mixture as plasma gas and Al-Ti-Ni-Si alloy as filler were investigated. The results show that the microstructure of the weld joints filled with Al-Ti-Ni-Si alloy was homogeneous and compact, and a little needle-like phases with length of 50 μm was found. The amount of Al_3Ti phase in the fusion zone was less than that in the center, and no gray needle-like Al_4C_3 phase was found. The joint with Al-5Ti-SNi-5Si alloy as filler had more reinforced phases than that with Al-10Ti-10Ni-3Si alloy, and the reinforced phases assumed disordered state, no needle-like phase was found. The weld joints were composed of AlN, Al_3Ti, TiC, Ni_3Al, NiTi_2 and Ti_5Si_3. The tensile strength of the two joints was 215.0 and 221.5 MPa respectively.
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