(哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國家重點實驗室，哈爾濱 150001)
摘 要: 采用旁軸送進(jìn)鋁絲結(jié)合同軸送給WC陶瓷粉末的工藝，在鋁基體表面進(jìn)行激光沉積，以獲得鋁合金表面的復(fù)合材料層。通過優(yōu)化工藝參數(shù)，得到較好的表面沉積層。采用XRD、SEM、EDAX等方法對沉積層進(jìn)行顯微組織分析。結(jié)果表明：沉積層中WC陶瓷顆粒在鋁基體中發(fā)生溶解，在WC陶瓷顆粒周圍生成大量桿狀和簇狀的Al4W、細(xì)小顆粒狀的W2C以及針狀的Al4C3。與基體相比，激光沉積復(fù)合材料層的硬度明顯提高。
關(guān)鍵字: 鋁基復(fù)合材料；激光沉積；絲粉同步；顯微組織
（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
