The invention relates to a
processing device for synthesizing a
surface layer of a nano-
composite material in situ by performing
friction stir processing (FSP) on a
metal workpiece through a stirring head capable of synchronously feeding
powder, and a method. A clamping part 1, a shaft shoulder 2 and a stirring probe 3 of the stirring head can be a rigid
whole body or a fastening coaxial separated body; a
powder feeding channel A is arranged in the stirring head; the inlet of the channel A is positioned on the side or middle axial position of the clamping part 1; and the outlet of the channelA is positioned on the surface of the middle axial position of the probe 3, which is contacted with the workpiece. During
processing, a hydraulic device in a worktable capable of automatically lifting is used for pressurizing along the axial direction B of the stirring head, a rotating shaft drives the stirring head to rotate at high speed and press the workpiece, an external automatic
powder feeder feeds sub-micron reinforcing phase powder into a seriously plasticized area C on the
surface layer of the workpiece through the powder feeding channel A of the stirring head, and the nano-
composite material is synthesized in situ through friction heat. The device is simple, is convenient to operate, is suitable for the composition and structure refining of various
metal substrates, and is highin technical and economic benefit and industrial application potential.