High-entropy alloy composite coating for improving surface hardness and wear resistance of metal substrate and processing method

The invention discloses a high-entropy alloy composite coating for improving surface hardness and wear resistance of a metal substrate and a processing method of the high-entropy alloy composite coating, a diamond grinding layer comprises high-entropy alloy components and diamond powder, and the high-entropy alloy components comprise Fe, Co, Cr, Ni, Al, Ti and a Si element of the same family as carbon; carburization from diamond to an alloy interface area occurs at the contact interface of the high-entropy alloy and diamond powder particles, a SiC high-hardness structure is formed between carbon and silicon on the surface layer of the diamond, hard metal silicide is formed between Si and other alloys, atoms on the surface layer of the diamond and the alloy contact surface are firmly combined on the atomic level by means of the transition element characteristic of Si, and the surface layer of the diamond is formed. The fixing strength of the diamond particles is improved. And the diamond-enhanced FeCoCrNiAlTiS