基于Cu表面原位制备高熵合金涂层的研究

In-situ synthesis high entropy alloy coating on copper surface using mechanicalSalloying method

摘要:

利用机械合金化法在纯Cu表面原位制备NiCoFeCuCr高熵合金涂层,采用XRD、SEM和EDS对涂层的物相、显微组织及成分进行分析,研究球磨时间对涂层的组织结构的影响,并分析了涂层的形成机理。结果表明：适当延长球磨时间有利于提高涂层的厚度和致密度,当球磨时间达到5Sh时,涂层最为致密,厚度约为40μm,且此时涂层与基体之间发生扩散而形成冶金结合。涂层的形成主要经历了合金粉末的镶嵌,冷焊,扩散和涂层的加工硬化四个阶段。

Abstract:

NiCoFeCuCr high entropy alloy coatings were in-situ synthesis on the cooper surface using mechanical alloying(MA) method. The phase composition and microstructure of the coatings were characterized using X-ray diffraction(XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy(EDS). The microstructure and the formation mechanism of the coatings were studied. It is revealed that increasing of milling time can enhance the thickness and densification of the coating. The most dense and uniform coating, with an average thickness of 40μm, were synthesized after MA for 5h, which metallurgically bonding with the copper substrate. The formation of the coating can be simpli?ed as follows:(1)Particles hammered into substrate. (2)Powder deposited on substrate through cold welding. (3)Diffusion between theScoating andSthe substrate. (4)Work hardening leading to spalling fatigue.