T700/Al and M40/Al composites were fabricated by squeeze casting technology, and their interface and mechanical properties were investi-gated comparatively. The results showed that both of the composites were dense, and the fibers were distributed uniformly in aluminum ma-trix. Aluminum carbide (Al_4C_3) was observed on the interface of the two carbon fiber-reinforced aluminum (Cf/Al) composites. There was little Al_4C_3 with a length of 300-500 nm and a width of 30-60 nm in the M40/Al composite, whereas there was a great deal of Al_4C_3 with a length of 200-400 nm and a width of 100-200 nm in the T700/Al composite, due to a higher graphitization of M40Cf than T700Cf. The M40/Al composite showed a much higher tensile strength than the T700/Al composite, and it was related to inteffacial bonding between carbon fibers and aluminum matrices.
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