通过4种不同功率的脉冲激光(150,250,350,450W)对铸态Al0.3CoCrFeNi高熵合金进行处理.按相对于激光源的位置,合金组织分为3个部分:内部具有细胞状结构的中心影响区,具有长条结构的边缘影响区,以及未受影响的原始晶粒区域.由于激光引起的快速熔化和凝固,经不同功率处理的样品截面中均观察到细胞结构;另外,在激光影响区边缘发现了长条细胞结构.之后,将激光处理的样品分别在660和800℃下退火2h,可以观察到沿细胞结构边界有沉淀相析出.通过硬度测试,表明激光表面处理和后续热处理相结合的方法显著提升了合金的硬度.“,”The as-cast Al0.3CoCrFeNi high-entropy alloy (HEA) surface was treated by pulsed laser at four different powers (150,250,350,450 W).According to the positions relative to the laser source,HEA structure could be transformed into three parts:the center of laser-affected zone with the cellular structure,the edge of laser-affected zone with the banded cellular structure along the grain boundary,and the unaffected area with original grains.Attributed to the rapid melting and solidification induced by pulsed laser,the cellular structure can be observed in all specimens processed at different powers.Additionally,the long cellular structures can be observed in the edge of the laser-affected zone.Then the specimens after pulsed laser surface treatment were annealed at 660 and 800 ℃ for 2 h,which leads to the precipitations along the boundaries of the cellular structure.The hardness test results show that the combined method of pulsed laser surface treatment with heat treatment improves the hardness of Al0.3CoCrFeNi HEA remarkably.