Abstract:B₄C_p/Mg-8Li-1Zn and B₄C_p/Mg-8Li-1Al-1Y composites were prepared with hot-extrusion solid-state composite processing. The microstructures and mechanical properties of the composites were studied. With the optimized parameters, the deformation effects and the migration of α phase are improved, and the amount and size of foil gaps are decreased. The bonding force between foils is improved, and the oxidation of foils is lowered. The results of tensile test show that the strengths of the B₄C_p/Mg-8Li-1Zn and B₄C_p/Mg-8Li-1Al-1Y composites are increased obviously after hot-extrusion solid-state composite processing (238 MPa and 257.23 MPa, respectively). The specific strength of B₄C_p/Mg-8Li-1Al-1Y composite is the highest (169.23×10³ cm).

Key words: Mg-Li base composites; B₄C; microstructures; mechanical properties