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采用机械搅拌和高能超声处理法制备了n-SiCp/AZ91D镁基复合材料,测试了复合材料的室温及高温力学性能。结果表明,n-SiCp的加入能显著提高复合材料的高温力学性能,当n-SiCp加入量为1.5%时,复合材料的抗拉强度和伸长率都达到最大值。随着温度的升高,复合材料的强度降低,伸长率增加。断口形貌观察表明,复合材料的断裂方式由室温下的准解理断裂转变为高温下的韧性断裂。
The n-SiCp / AZ91D magnesium matrix composites were prepared by mechanical stirring and high-energy ultrasonic treatment. The mechanical properties of the composites were tested at room temperature and high temperature. The results show that the addition of n-SiCp can significantly improve the high-temperature mechanical properties of the composites. When the amount of n-SiCp is 1.5%, the tensile strength and elongation of the composites reach the maximum. As the temperature increases, the strength of the composite decreases and the elongation increases. The fracture surface morphology shows that the fracture mode of the composite material changes from quasi-cleavage fracture at room temperature to ductile fracture at high temperature.