1.State Key Laboratory of Structural Analysis for Industrial Equipment，School of Automotive Engineering，Dalian University of Technology，Dalian 116024，China
2. Ningbo Research Institute，Dalian University of Technology，Ningbo 315016，China
Based on the structural analysis of metal hollow sphere composites，metal hollow sphere composites were prepared by metal mold gravity casting. The technological process of metal mold gravity casting of metal hollow sphere composite is introduced，and a metal mold with low cost，simple molding and multiple use is designed. The experimental trial production and material verification of metal hollow sphere composite are carried out. The results show that the metal hollow sphere composite with complete pore wall structure and random distribution of pores can be prepared by metal mold gravity casting method, and the single design and gradient design of hollow spheres can be realized. The matrix and hole wall structure of metal hollow sphere composites are relatively dense，and the thickness is about 25～30 μm interface layer. The stress-strain curve of metal hollow sphere composite has obvious elastic stage，plastic plateau stage and densification stage，and the metal hollow sphere composite material designed with hollow sphere gradient has significantly improved its basic mechanical properties compared to the metal hollow sphere composite material designed with a single hollow sphere.Finally，compared with the traditional closed cell aluminum foam，the metal hollow spheres composite has higher overall stability and stronger energy absorption.