Taking domestic carbon fiber M55 J as reinforcement and ZL301 as matrix alloy

three-dimensional five-directional M55 J/Al composites were fabricated by vacuum pressure infiltration method. The compactness and microstructure of the composites as well as the tensile properties were investigated at room temperature and high temperature（350 ℃）. The fiber dimension was extracted from the composites to observe and analyze fiber damage. The results indicate that the compactness of the three-dimensional five-directional M55 J/Al composite is 97.8% with desirable infiltration effect. After impregnation

the mean tensile strength and modulus of M55 J monofilament reach 3 440 MPa and 513 GPa

respectively

which are slightly lower than those of precursor. The tensile strength and modulus of three-dimensional five-directional M55 J/Al composites are 601.3 MPa

689.7 MPa

and 181.6 GPa

146.7 GPa

respectively at room temperature and 350 ℃. The high temperature strength may be attributed to the reduced binding of matrix to braided yarn and absence of bending and necking phenomenon.