等离子合金化AlCoCrCuFe_xMnNi高熵合金涂层的组织与性能

在45#钢基体上采用等离子束合金化法制备AlCoCrCuFe_xMnNi高熵合金涂层。采用SEM,EDS,XRD等研究高熵合金涂层的组织,利用显微硬度计测试涂层的显微硬度分布。结果表明:采用等离子束合金化Al,Co,Cr,Cu,Mn和Ni等摩尔单质金属粉,在等离子束作用下45#钢基材中的Fe元素参与表面合金化,形成了厚度约为1 mm的AlCoCrCuFe_xMnNi七主元高熵合金涂层,涂层主要由BCC结构的枝晶和FCC结构的枝晶间组织组成。另外,还有σ相主要分布在枝晶间,涂层从表面到基材,体系的混合熵呈高熵-中熵-低熵梯度变化。涂层的维氏显微硬度(HV0.2)达到670~400的梯度分布。

Microstructure and properties of AlCoCrCuFexMnNi high-entropy alloy coating prepared by plasma surface alloying

The AlCoCrCuFexMnNi high-entropy alloy (HEA) coating was prepared on 45# steel substrate by plasma alloying method. Microstructure of the HEA coating was analyzed by SEM, EDS and XRD. The microhardness distribution of coating was tested by microhardness tester. The results show that the principal element of Fe in the 45# steel substrate participates in surface alloying process during the plasma irradiation alloying. The microstructure of the AlCoCrCuFexMnNi HEA coating with a thickness of 1 mm is mainly composed of dendritic structure and interdendritic structure. The alloy mainly composes of FCC, BCC andσ phases. From the surface of high entropy alloying coating to substrate, there is a gradual distribution of the mixing entropy from high entropy, medium entropy to low entropy. The microhardness of the coating reaches 670?400 HV0.2.