铝合金表面激光熔覆Cu基复合涂层的组织及摩擦磨损性能

利用铜基熔体的液相分离作用，采用激光熔覆工艺，在ZL104合金表面成功获得了球形颗粒体增强的过饱和（Cu, Ni）固溶体基复合材料涂层。（Cu，Ni）固溶体的组织形态为胞状和树枝状，球形增强体内亚组织形态为颗粒状、穗状或树叶状。干滑动摩擦磨损试验表明复合材料熔覆层对ZL104合金表面耐磨性的提高作用很大。磨损过程中，ZL104合金主要发生了粘附磨损，出现了脱层现象；熔覆层材料发生了粘附磨损和磨粒磨损。

Microstructure and Friction-wear Properties of Laser Clad Cu-base Composite Coating on Al Alloy Surface

(Cu, Ni) solid solution based composite coating was successfully deposited on surface of Al alloy ZL104 via laser cladding process on the basis of metastable liquid separation in Cu-base melt. The composite was reinforced by in situ spherical particles. Friction and wear test of the coating was made.The results show that the (Cu, Ni) solid solution has cellular and dendritic microstructure, while the spherical particles have granular, spike or leafy substructure. The laser clad composite coatings greatly improve the wear properties of Al alloy ZL104. This contributes to high hardness of the composite and existence of the reinforced spherical particles, and also to poor mutual solubility of Cu and Fe. During the friction and wear test, ZL104 alloy mainly undergos adhesive wear and delamination while the laser clad composite under adhesive wear and abrasive wear.