Abstract: B¹⁰ has excellent thermal neutron shielding performance. B₄C_p/Al composite large size sheet with high B¹⁰ content, good fracture toughness and plastic deformation prosessing has a broad application prospect in the post-processing of spent fuel. However, with the increase of the content of B₄C particles, the brittle phases at the interface between B₄C and Al increase, resulting in poor toughness of B₄C_p/Al composites, weakened the plastic deformation ability, and the subsequent plastic processing formability. Therefore, the key to preparing high boron content B₄C_p/Al sheet with good thermal neutron shielding performance is to improve the plastic deformation capacity and hot rolling performance of B₄C_p/Al composites by controlling the interface reaction products of B₄C particles and Al matrix under the premise of ensuring the high content of B₄C particles. This article first introduces the fabrication method of B₄C_p/Al composite and focusing on infiltration especially. This article also introduces the plastic deformation mechanism of B₄C_p/Al, and reviews the effects of hot working temperature, strain rate and interface structure on the plastic deformation capacity and hot rolling properties of B₄C_p/Al, meanwhile, the recent results about controlling the infiltration temperature, adding alloying elements or ceramic phase to adjust the composition and structure of the B₄C_p/Al interface were introduced. In the end, this article points out the future directions of fabrication and processing of high boron content B₄C_p/Al large size composite sheet for spent fuel reprocessing by infiltration and hot rolling.

Key words: B₄C/Al, infiltration, plastic deformation, hot rolling, interface, composites