Method for preparing lamellar gradient structure on surface of plate-like metal

The invention provides a method for preparing a lamellar gradient structure on the surface of a plate-like metal. According to the method provided by the invention, the technology is stable and the operation is simple; a structure of which the microstructure is lamellar nano grain can be prepared on the surface of a plate-like metal material; the characteristic that nano grains, submicron grains, micron grains and original coarse grains are sequentially distributed from the surface of the metal material to the interior of the material in a lamellar and gradient manner is reflected; and strength and hardness of the metal material are effectively improved while the plasticity and toughness of the metal material are maintained.