采用粉末冶金法制备了φ300mm的15%(体积分数)SiCp/Al复合材料坯锭,研究了热挤压、锻造后的材料力学性能以及断裂特点.结果表明,该材料的弹性模量在97 GPa、拉伸强度保持在550 MPa的水平下,延伸率仍高达7%左右,旋转弯曲疲劳强度在250~290 MPa范围内,断裂韧性为25 MPa·m1/2,冲击韧性为62.5 kJ/m2.与棒材挤压态相比,T4态复合材料拉伸强度和屈服强度分别提高66.7%和100%,但塑性保持在同一水平.断口观察表明,挤压态复合材料以基体韧性断裂为主要形式,而T4态复合材料除了基体韧性断裂外,还存在SiC颗粒断裂现象.挤压棒材锻造后有利于提高材料的横向强度.
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