定向凝固Cu-Cr自生复合材料的拉伸性能和断口形貌特征

Tensile Properties and Fracture Morphology of Directionally Solidified Cu-Cr In-situ Composites

研究了Cu Cr自生复合材料定向凝固试样的轴向拉伸性能和拉伸断裂机制,探讨了凝固速率对性能及断口形貌的影响。结果表明:Cu Cr自生复合材料具有良好的常温拉伸性能,随着凝固速率增加,材料的轴向拉伸强度呈上升趋势。断口形貌观察表明:复合材料中的纤维状共晶体(α+β)是应力的主要承载体,共晶体的断裂是Cu Cr自生复合材料断裂的控制机制。

Tensile properties and fracture mechanism of directionally solidified Cu-Cr in-situ composites were studied, and the influence of solidification rates on the properties and the fracture morphology were analysed. It is shown that Cu-Cr in-situ composites possess superior tensile properties. With the increase of the solidification rates, the tensile strength increases. The fracture morphology shows that the fibre-like eutectic as reinforce phase are chief undertaker of stress , and the fracture of the eutectic is the critical factor for the fracture of Cu-Cr in-situ composites.