论文部分内容阅读
采用粉末半固态触变挤压工艺制备SiC含量为5%、10%和15%的2024铝基复合材料棒材,研究了真空烧结工艺和SiC颗粒含量对复合材料组织及性能的影响。结果表明,孔洞的存在对复合材料性能影响较大。经过真空处理的复合材料孔隙率比未经处理的减小65.3%,抗拉强度提高了9.7%。随着SiC含量的提高,复合材料的强度、硬度增加,塑性降低,SiC含量为15%的复合材料抗拉强度相比SiC含量为5%的复合材料提高了14.1%,伸长率则降低了51.9%,而且随着SiC含量的增加,脆性断裂趋势更加明显。
A 2024 aluminum matrix composite bar with SiC content of 5%, 10% and 15% was prepared by powder semi-solid thixo-extrusion process. The effects of vacuum sintering process and SiC particle content on the microstructure and properties of the composites were investigated. The results show that the existence of holes has a great influence on the properties of composites. The porosity of vacuum-treated composites decreased by 65.3% and the tensile strength increased by 9.7% compared with the untreated ones. With the increase of SiC content, the strength and hardness of the composites increased and the plasticity decreased. The tensile strength of composites with SiC content of 15% increased by 14.1% and the elongation decreased with the increase of SiC content 51.9%, and with the increase of SiC content, the tendency of brittle fracture becomes more obvious.