▎ 摘　　要

NOVELTY - The method comprises (i) dividing nano-enhanced phase into three parts, dividing all elemental powder into A and B parts, uniformly mixing the A part and B part with nano-enhanced phase, respectively to obtain mixed powder I and mixed powder II, uniformly mixing the nano-enhanced phase with metal powder to obtain mixed powder III, (iii) subjecting the mixed powder I and the mixed powder II to different ball milling processes to obtain ultra-fine crystal composite powder I and fine crystal composite powder II, respectively, (iv) mixing the composite powder I and the composite powder II and the mixed powder III which is not ball milled to obtain composite powder III, (iv) performing densification and sintering treatment to the composite powder III, and (vi) performing thermal deformation processing heat treatment to the obtained composite ingot blank, obtaining nano-reinforced metal-based composite material whose matrix structure and grain structure is a three-peak size distribution. USE - Element alloying preparation method of three-peak crystal grain structure metal-based composite material used in infrastructure, automation, automobile industry and aerospace fields. ADVANTAGE - The method enables to prepare three-peak crystal grain structure metal-based composite material that has high-efficiency and controllable preparation method, and effectively relieves stress-strain concentration, strong plasticity of synchronous lifting material, and does not need to use alloy powder, using metal element powder by sintering densification process to realize alloying, can randomly design and control the alloy component of the base, and can effectively relieve the stress concentration of the coarse crystal region and the fine crystal region. DESCRIPTION OF DRAWING(S) - The drawing shows a process flow chart of an element alloying preparation method of three-peak crystal grain structure metal-based composite material. (Drawing includes non-English language text).