Cu单元素基合金表面FeCoCrAlCu激光高熵合金化涂层的制备

Synthesis of FeCoCrAlCu laser high entropy alloying coating on surface of single-element Cu base alloy

采用Nd:YAG激光辐照法在Cu单元素基合金表面制备FeCoCrAlCu高熵合金化涂层。利用扫描电镜、能谱仪、X射线衍射仪、显微硬度计及纳米压痕仪等研究FeCoCrAlCu激光高熵合金化层形成机制及性能。结果表明:采用优化的激光辐照工艺参数对等摩尔比的Fe、Co、Cr、Al四元合金粉末进行激光辐照合金化,可制备出含有基体主元Cu的FeCoCrAlCu高熵合金化涂层。合金化涂层由FCC+BCC简单结构固溶体组成,其显微组织主要以颗粒状组织为主,且与基体呈良好的冶金结合。Fe CoCrAlCu激光高熵合金化层的硬度是基体材料的7倍以上,其弹性模量、弹性比和同样深度承受的最大载荷远高于基体材料的,具有良好的强度和韧性。

FeCoCrAlCu high entropy alloying coating was synthesized by Nd：YAG laser irradiation method on Cu single-element base alloy. Formation mechanism and properties of FeCoCrAlCu laser high entropy alloying layer were investigated using SEM, EDS, XRD, microhardness tester and nanoindentation tester. The results show that FeCoCrAlCu high entropy alloying coating can be synthesized on the surface of Cu single-element base alloy using equal molar ratio of Fe, Co, Cr, Al quaternary alloy powders by laser irradiation alloying with optimized processing parameters. The alloying coating is composed of FCC＋BCC simple structural solid solutions, and the microstructure is mainly granuliform. A good metallurgical bonding between the layer and the substrate can be achieved. The microhardness of FeCoCrAlCu layer is 7 times higher than that of the substrate, and the elastic modulus, elasticity ratio and the maximum load subjected at the same depth of the layer are higher than those of Cu substrate, indicating that the alloying coating has good strength and toughness.