论文部分内容阅读
开展了粉末冶金法制备的20%SiC_p/2009Al复合材料坯锭的等温锻造实验,通过金相观察、扫描电镜(SEM)、拉伸和断裂韧性测试等方法研究了不同变形量对锻件微观组织和力学性能的影响。结果表明,随着等温锻造变形量的增大,SiC颗粒分布更加均匀,锻件的强度和塑性显著提高。通过SEM对材料断裂韧性裂纹扩展路径观察发现,主裂纹扩展发生在SiC颗粒偏聚区域的铝基体中。复合材料的断裂方式为以基体韧性断裂和增强体脆性断裂这2种方式为主。
The isothermal forging experiment of 20% SiCp / 2009Al composite billets prepared by powder metallurgy was carried out. The effects of different deformations on microstructure and mechanical properties of forgings were studied by means of metallographic observation, scanning electron microscopy (SEM), tensile and fracture toughness test, Effect of mechanical properties. The results show that with the increase of the isothermal forging deformation, the distribution of SiC particles is more uniform and the strength and ductility of the forging are significantly increased. SEM observation of the material’s fracture toughness crack propagation path shows that the main crack propagation occurs in the aluminum matrix in the segregation zone of SiC particles. The fracture mode of composites is mainly based on the ductile fracture of the matrix and the brittle fracture of the reinforcement.