Method for preparing copper-silver alloy hydrogen evolution catalyst through friction stir processing

The invention relates to a method for preparing a copper-silver alloy hydrogen evolution catalyst through friction stir processing. A blocky metal copper plate, a copper sheet and a silver sheet are used as raw materials; the metal copper plates and the copper-silver sheets arranged in a staggered mode are fixed to a workbench of a friction stir welding machine through a clamp, the silver sheets and the copper sheets are clamped between the two copper plates in a staggered mode, and the overlapping width of the copper-silver sheets is smaller than the diameter of a stirring head; a stirring head with a shaft shoulder is used; when machining begins, the stirring head is aligned with the copper-silver sheet, the stirring head is adjusted to be pressed downwards until the stirring needle is completely immersed into machining metal, and the stirring head automatically rotates and advances to the other end along one end of the copper-silver sheet for mixing once; the surface copper-silver boundary disappears; a me