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本文采用激光焊接SiC_p/6063铝基复合材料,并利用Ti对焊缝进行原位增强。研究结果表明,焊缝和热影响区均较窄,焊缝中观察不到孔洞存在。对焊缝中心的微观组织分析表明,焊缝基体的晶粒非常细小,呈等轴结晶方式,焊缝组织非常致密,没有明显的微观气孔和裂纹。焊缝中已经观察不到SiC颗粒与基体在熔焊条件下发生反应生成的针状反应物Al_4C_3,而是尺寸更为细小的TiC颗粒,近似呈球形,在焊缝中分布比较均匀。整个焊接区域转变为母材是SiC颗粒增强的Al基复合材料,而焊缝主要是以TiC颗粒增强相以Ti为基体的局部区域。研究结果表明,用钛作为合金化元素通过使用原位焊缝合金化/脉冲激光焊接SiC_p/6063复合材料可以达到完全抑制在焊缝中心区形成Al_4C_3,焊缝接头强度由于快速固化的TiC等相而得到提高。
In this paper, laser welding SiC_p / 6063 aluminum matrix composites, and the use of Ti on the weld in situ enhanced. The results show that the weld and HAZ are narrow and no holes are observed in the weld. The microstructure analysis of the center of the weld shows that the grains of the weld matrix are very small and equiaxed. The microstructure of the weld is very dense with no obvious microscopic pores and cracks. In the weld seam, the needle-shaped reactant Al_4C_3, which is formed by the reaction of SiC particles and the matrix under the welding condition, has not been observed. Instead, the TiC particles with the smaller size are almost spherical and distributed uniformly in the weld. The entire welding area is transformed into the base metal is SiC particle reinforced Al-based composite material, and the weld is mainly TiC particles reinforced Ti-based local area. The results show that the use of titanium as the alloying element by in situ weld alloying / pulsed laser welding SiC_p / 6063 composites can be completely inhibited in the weld center area formation of Al_4C_3, weld joint strength due to rapid solidification of TiC phase And be improved.