High-strength, high-toughness and plastic neutron absorption plate and manufacturing method thereof

The invention discloses a high-strength, high-toughness and plastic neutron absorption plate and a manufacturing method thereof, and belongs to the field of neutron absorption materials. According to the method, the content of a mixed grain structure and a nano Al2O3 reinforced phase in a neutron absorption material matrix is regulated and controlled by mixing aluminum powder with different thicknesses; the amorphous Al2O3 on the surface layer of the aluminum powder can effectively hinder fusion and growth of different aluminum powder grains, so that the grain size distribution characteristics of the aluminum powder with the mixed grain size can be reserved after forming processing, and a mixed grain structure is formed in the Al2O3/B4C/Al neutron absorption material. By controlling the specific surface area and the oxygen content of the aluminum powder with the mixed particle size, it can be guaranteed that in-situ nano Al2O3 with the sufficient content is introduced, the grain boundary can be pinned and str