The M40 carbon fibers reinforced magnesium matrix composites were fabricated by pressure infiltration method. The interfacial reactions and mechanical properties of the composites were optimized by adjusting the preheating temperatures of the preform (PRT) and the casting temperatures of the melting (CAT). The lower preheating temperatures of preform resulted in casting defects at the interface between carbon fibers and magnesium matrix and making composites rapidly to be failed in a brittle fracture mode. In addition, the higher casting temperatures of melting would result in excessive interfacial reactions at the interface, which would weaken the reinforcement effect of the carbon fibers. When the preheating temperature of the preform was 550 °C and the casting temperature of melting was 760 °C, the moderate interfacial reactions occurred at the interface and the bending strength of the composites reached its maximum value of 1793 MPa.

采用压力渗透法制备了M40碳纤维增强镁基复合材料。通过调整预成型件的预热温度（PRT）和熔体的浇铸温度（CAT），可以优化复合材料的界面反应和机械性能。预成型坯较低的预热温度导致碳纤维和镁基体之间的界面出现铸造缺陷，并使复合材料以脆性断裂模式迅速失效。另外，较高的熔融铸造温度将导致界面处过度的界面反应，这将削弱碳纤维的增强作用。当预成型坯的预热温度为550°C，熔化的浇铸温度为760°C时，