前言 激光合金化是利用聚焦激光光源的高密度能量使金属涂层和它下面的一部分衬底材料发生熔化的一种材料处理方法。因为熔化是在很短的时间内发生的,且只是发生在表面,且材料本体仍然是冷的,所以材料本体便起到了一种无限散热器的作用。在表面熔化区和它下面的固体衬底间的界面间存在很大的温度梯度,其结果便导致了快速的自身 Introduction Laser alloying is a material processing method that utilizes the high-density energy of a focused laser source to melt a metallic coating and a portion of the underlying substrate material. Because melting takes place in a short time and occurs only on the surface and the material body is still cold, the material body acts as an infinite heat sink. There is a large temperature gradient between the surface melting zone and the interface between the solid substrate beneath it, resulting in a rapid self