【摘要】 对TiCp增强AZ91复合材料室温下进行拉伸试验时发现,随着复合材料中TiCp含量的增加其断口形貌发生明显变化。认为TiCp的加入,使得复合材料断裂机制发生了转变。当TiCp含量较低时,复合材料的断裂主要由β-Mg17Al12相控制,断口中韧窝明显。随着TiCp含量的增加,断裂机制转变为TiC与α-Mg/β-Mg17Al12脱粘机制即由界面控制,断口中韧窝不再明显。当TiCp含量继续增加,颗粒在基体内逐渐团聚。此时材料的断裂为TiCp团簇控制机制。实验表明,TiCp含量在6%时复合材料的抗拉强度达到最高,对应的断裂机制为界面控制机制。同时随着TiCp含量的增加复合材料硬度增加显著。更多还原

【Abstract】 The tensile testing of TiCp reinforced magnesium matrix composites at room temperature showed that characteristic of the fracture mechanism changed obviously with the increasing of TiCp content. The fracture mechanism of the composites with low TiCp content was controlled by β-Mg17Al12. The fracture mechanism changed to interface mechanism between TiC and α-Mg/β-Mg17Al12 with TiCp increasing. Eventually, the fracture mechanism was controlled by agglomerated particles owing to adding excessive TiCp. The results showed that the tensile strength of TiCp/AZ91 composites with 6% TiC content was best corresponding to interface mechanism between TiC and α-Mg/β-Mg17Al12. And the hardness of the composites was improved obviously.更多还原