Preparation method of TC4 titanium alloy surface strengthening layer

The invention discloses a preparation method of a TC4 titanium alloy surface strengthening layer, relates to a method for preparing a strengthening layer on the TC4 titanium alloy surface by using an electric spark machine tool, and belongs to the technical field of non-traditional machining. The problems that an existing metal surface strengthening technology is unstable in effect, complex in process, high in equipment requirement, low in machining efficiency and the like are solved. The preparation method mainly comprises the following steps: grinding, polishing and cleaning the to-be-strengthened surface of the TC4 titanium alloy; adding the solid powder into deionized water to prepare a mixed powder solution; clamping the sample on an electric spark machine tool, and dispersing the mixed powder solution into mist by using a mist generator; and preparing a surface strengthening layer on the sample. The method is simple in process, convenient to operate and low in production cost. By means of the mixed powd