Ti_2SnC颗粒增强铜基复合材料的力学性能

MECHANICAL PROPERTIES OF Ti_2SnC PARTICULATE REINFORCED Cu MATRIX COMPOSITES

用粉末冶金方法制备了一种以三元层状陶瓷Ti2SnC为增强相的Cu/Ti2SnC复合材料,研究了增强相的含量对复合材料的显微结构和硬度、拉伸强度等力学性能的影响.结果表明, Ti2SnC对于铜是一种有效的增强相,当Ti2SnC的体积含量为20％(体积分数,下同)时增强效果最佳,屈服强度和拉伸强度分别达到319 MPa和440 MPa,是相同工艺条件下制备的纯铜的屈服强度和拉伸强度的4倍和2倍,并保持12％的延伸率.强化是由于铜基体晶粒的细化和位错塞积引起的.

A new Cu matrix composite was developed utilizing layered ternary Ti2SnC ceramic as reinforcement. The Cu/Ti2SnC composites with different volume percent of Ti2SnC were prepared by the powder metallurgy method, and the effect of Ti2SnC content on microstructure, hardness and tensile strength of the composites were investigated. The results demonstrate that Ti2SnC is an effective reinforcement for Cu. The Cu-20% (volume fraction) Ti2SnC has yield and ultimate strengths of 319 MPa and 440 MPa, respectively, which is 4 and 2 times that of pure Cu, while the elongation keeps at 12%. The main mechanisms for the strengthening of Cu are grain refinement and dislocation pile-up.