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以Ti-Ni合金作为填加材料,采用氮氩混合等离子气对SiCp/Al基复合材料进行等离子弧原位焊接。结果表明,填加Ti-Ni合金进行等离子弧原位焊接,在焊缝组织中生成了新的增强颗粒TiN,TiC,AlN,Al3Ti和Al3Ni,未发现明显的针状相生成,有效的抑制了脆性相Al4C3,并且接头组织致密,结合较好。Ni元素的添加,降低了SiC溶解程度,使得熔池中的结晶热显著提高,改善了熔池的流动性。同时在焊缝组织中形成了新的增强相AlNi,Al3Ni,从而有效地提高接头的力学性能。采用Ti-Ni合金进行等离子弧原位焊接,接头的抗拉强度为215.4 MPa,达到母材强度的67.3%。
The Ti-Ni alloy was used as filler and the plasma arc welding was performed on the SiCp / Al matrix composites by using nitrogen-argon mixed plasma. The results show that TiN, TiC, AlN, Al3Ti and Al3Ni are produced in the weld by plasma arc welding after Ti-Ni alloy is filled in. No obvious formation of acicular phase is found and the effective inhibition Fragile phase Al4C3, and the joint tissue dense, better bonding. Ni element addition, reducing the degree of dissolution of SiC, making the molten pool significantly increased the heat of crystallization, to improve the flow of the pool. At the same time, a new reinforcing phase AlNi, Al3Ni was formed in the weld seam, so as to effectively improve the mechanical properties of the joint. The Ti-Ni alloy was used for in-situ plasma arc welding. The tensile strength of the joint was 215.4 MPa, reaching 67.3% of the base metal strength.