钎料形态对半固态加压反应钎焊接头的影响

采用自制不同形态的Al-Si-Mg-Cu-Ti钎料对70% SiC_p/Al复合材料进行了半固态加压反应钎焊，阐述了该焊接方法的内涵，分析了接头组织性能. 结果表明，填充粉末钎料时，钎缝组织为铝合金基体、深灰色环状和块状Ti₇Al₅Si₁₂和块状Ti；填充片状钎料时，钎缝组织为铝合金基体和短棒状Ti₇Al₅Si₁₂. 接头界面结合情况是影响接头性能的主要因素. 填充粉末钎料时，钎料与母材结合充分，原子扩散通道多，接头界面结合好，没有明显分界线，接头力学性能好，抗剪强度达92.1 MPa，断口属于韧脆混合断口；填充片状钎料时，界面处有明显分界线，接头力学性能差，抗剪强度为43.9 MPa，断口为脆性断口.

Influence of the filler metals' forms on semi-solid pressure reaction brazing joints

70% SiC_p/Al composites were semi-solid pressure reaction brazed with the Al-Si-Mg-Cu-Ti filler metal in different forms, the connotation of the welding method was expounded, and the microstructures and properties of the joints were analyzed. The results indicated that the joints mainly contain Al matrix, dark gray ringed and massive Ti₇Al₅Si₁₂ compound, and massive Ti phase when they were filled with pulverous filler metal; the joints mainly contained Al matrix and short clubbed Ti₇Al₅Si₁₂ compound when they were filled with schistose filler metal. The bonding of interface was the main factor affecting the performance of the joint. The filler metal and the base material were fully combined during brazing when they were filled with powder filler metal, which provided many atomic diffusion channel at the interface of the joint, so that they were well combined without clear dividing line, the shear strength of the joint reached 92.1 MPa, and the fracture was ductile and brittle mixed fracture; There was clear dividing line at the interface when the filler metal was schistose, so that the shear strength of the joint was low, 43.9 MPa, and the fracture was brittle fracture.