TiNb／Ti—48Al—2Cr—2Nb复合材料的力学性能和断裂特征

Mechanical Property and Fracture Behavior of the TiNb/Ti-48Al-2Cr-2Nb Composite

摘要:

采用粉末冶金、热压成型工艺制备了TiNb/Ti-48Al-2Cr-2Nb(TACN)基复合材料。研究了复合材料的弯曲性能和断裂特征。实验结果表明：复合材料的性能较基体有较大的提高，用混合法则来进行预测复合材料的力学性能和实验中所得结果十分接近；这种工艺制备的复合材料界面由全片层组织构成，纤维和基体的结合状态良好，纤维损伤比例较小。

Abstract:

Powder metallurgy and hot pressed technology were adopted to manufacture the TiNb fiber reinforced TiAl matrix composites. The bending strength as well as the fracture toughness of the material were investigated. Results show that the TiNb/TiAl composite has a better property than the matrix, and the bending strength in the laboratory corresponds to the forecast of the mixture rule very well. Furthermore, the interface of the composite is consisted of full lamella structure, the matrix and fibers combine well, and the damaging ratio of the fibers is little due to the manufacture technology. It is showed that the PM technology is a good method to manufacture the TiAl matrix composite.