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采用预置粉末的方式在钛合金Ti6Al4V表面激光熔覆纯Cu粉,利用热力学相图软件(Thermo-Calc)对Ti-Cu-Al-V合金体系进行平衡相图计算、根据平衡相图推测涂层中可能存在的相,运用DICTRA软件模拟计算纯Cu粉在Ti6Al4V表面凝固过程及元素扩散行为。结果表明,涂层主要存在相为Cu Ti2、Cu Ti3、Ti(Cu,Al)2、Al2Cu3,熔覆层主要组织为交错的树枝晶,熔覆层的显微硬度大大高于基体,耐磨性能显著提高,当激光功率P为2.2 k W时,熔覆层硬度、耐磨性能相对较优。
The powder of pure titanium was laser cladding on the surface of Ti6Al4V titanium alloy. The equilibrium phase diagram of Ti-Cu-Al-V alloy system was calculated by thermogravimetry software (Thermo-Calc). According to the equilibrium phase diagram, Layer may exist in the phase, the use of DICTRA software to simulate the pure Cu powder solidified on the Ti6Al4V surface and element diffusion behavior. The results show that the main phases of the coatings are Cu Ti2, Cu Ti3, Ti (Cu, Al) 2 and Al2Cu3. The main microstructure of the coating is staggered dendrites. The microhardness of the coating is much higher than that of the matrix. The performance is significantly improved. When the laser power P is 2.2 k W, the hardness and wear resistance of the cladding layer are relatively good.