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采用激光熔覆方法将Al、Cu、Fe的混合粉末在铝基材料上制备复合准晶涂层。研究了重熔对相形成的影响及其硬度变化。涂覆层中的胞状组织由基体开始生长。准晶I相可以在各个区域结合铝化合物形成。同样,准晶I相还可以由液相和Al13Fe4发生包晶反应形成,也可以从液相中直接形核而成。很明显,在不同的过冷度下,激光热处理过程中液相转变是先于初生相形核的。涂覆层的最外层,伴随着十字星状Al13Fe4形成。就相转变而言,涂覆层的重熔导致了组织的变化,长条状的Al13Fe4就是在重熔时形成的。激光涂覆层和重熔层的硬度均可以达到600左右(HV0.025)。
A laser cladding method was used to prepare composite quasicrystalline coatings on Al-based materials by mixing powders of Al, Cu and Fe. The effect of remelting on the formation and the change of hardness were studied. The cellular tissue in the coating begins to grow from the matrix. The quasicrystalline I phase can be formed by combining aluminum compounds in various regions. Similarly, the quasicrystal I phase can also be formed by the peritectic reaction of the liquid phase and Al13Fe4, can also be formed directly from the liquid nucleus. Obviously, under different degrees of undercooling, the liquid phase transformation during the laser heat treatment precedes the nucleation of the primary phase. The outermost layer of the coating, along with the cross-shaped Al13Fe4 formation. In the case of phase transitions, the remelting of the coating causes a change in the structure, and strip-shaped Al13Fe4 forms on remelting. The hardness of laser coating and remelting layer can reach about 600 (HV0.025).