通过碳热还原法制备了气孔率为53.4％～70.2％的β-Si3 N4多孔预制体,利用挤压铸造法制备双连续β-Si3N4增强铝基复合材料.随着β-Si3N4陶瓷增强相体积分数的增加,复合材料的弯曲强度由383.9 MPa增加到584.8 MPa,显微硬度由162.7HV增加到241.5HV,断裂韧性由11.9 MPa·m1/2下降到9.5 MPa·m1/2.铝合金基体的断裂模式是韧性断裂,β-Si3 N4棒状晶的断裂模式受到晶粒取向的影响.复合材料强韧化机制主要有负荷传递、位错增殖、裂纹桥联、裂纹偏转和微裂纹增韧.
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