(哈尔滨工业大学先进焊接与连接国家重点实验室，哈尔滨 150001)
摘 要: 采用旁轴送进铝丝结合同轴送给WC陶瓷粉末的工艺，在铝基体表面进行激光沉积，以获得铝合金表面的复合材料层。通过优化工艺参数，得到较好的表面沉积层。采用XRD、SEM、EDAX等方法对沉积层进行显微组织分析。结果表明：沉积层中WC陶瓷颗粒在铝基体中发生溶解，在WC陶瓷颗粒周围生成大量杆状和簇状的Al4W、细小颗粒状的W2C以及针状的Al4C3。与基体相比，激光沉积复合材料层的硬度明显提高。
关键字: 铝基复合材料；激光沉积；丝粉同步；显微组织
（State Key Laboratory of Advanced Welding and Joining,
Harbin Institute of Technology, Harbin 150001, China）
Abstract:Through coaxial ceramic powder feeding and wire feeding simultaneously, aluminum matrix compounds layer was fabricated on the aluminum alloy by laser deposition. Ideal metal matrix compounds (MMC) layer was produced by optimized parameters. XRD, SEM, and EDAX were conducted to analyze the microstructure of the aluminum matrix compounds. The results show that WC particle dissolves into aluminum matrix, leading to the formation of a large number of rod-shaped and tufted Al4W, tiny granule-shaped W2C and needle-shaped Al4C3. Compared with aluminum substrate, the microhardness of MMC layer is improved significantly.
Key words: Al matrix compound; laser deposition; coincident wire-powder feeding; microstructure
