n-SiC_p/AZ91D镁基复合材料高温力学性能  

Mechanical Properties of n-SiCp/AZ91D Magnesium Matrix Composites at Elevated Temperature

作　　者：朱雪[1] 李文珍[1] 刘世英[1] 何广进[1] 朱先朋[1] 

机构地区：[1]清华大学机械工程系先进成形制造教育部重点实验室

出　　处：《特种铸造及有色合金》2011年第9期851-855,共5页Special Casting & Nonferrous Alloys

摘　　要：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。n-SiCp/AZ91D magnesium matrix composites were fabricated by mechanical stirring and high intensity ultrasonic dispersion processing,and mechanical properties of the composites at room temperature and at high temperature were examined.The results show that the elevated mechanical properties of the composites are greatly improved by introducing n-SiC particle.The maximum value of tensile strength and elongation of the composites can be observed with 1.5% SiC particle addition.However,with the temperature increase,the tensile strength is decreased,and elongation is further increased.The fractography observation reveals that the fracture mechanism of the composites is transformed for quasi-cleavage fracture at room temperature into the ductile one at high temperature.

关 键 词：超声处理 纳米SIC颗粒 镁基复合材料 高温力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程] TG146.22[金属学及工艺—金属材料]