拉伸力学行为的影响
(1. 北京理工大学 爆炸科学与技术国家重点实验室，北京 100081；
2. 西北有色金属研究院，西安 710016)
摘 要: 研究TiC颗粒增强钛基复合材料TP-650室温拉伸状态下的应变率效应。通过与基体材料对比的准静态和动态拉伸力学实验，并利用扫描电镜SEM观察断口形貌特征，分析TiC颗粒增强钛基复合材料的拉伸力学行为。结果表明：应变率对颗粒增强钛基复合材料的力学行为具有较复杂的影响。在准静态下，基体和复合材料都非常接近理想弹塑性材料，且由于TiC颗粒的加入，TP-650钛复合材料较基体表现出较好的增强效果；在高应变率下，复合材料的力学性能并不优于基体材料的，且表现出较高的脆性；复合材料和基体材料在不同应变率条件下都不呈现单调的应变率效应。
关键字: TiC；钛基复合材料；TP-650钛基复合材料；应变率效应；拉伸断裂
titanium matrix composite
（1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
2. Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China）
Abstract:The strain rates effect of TiC-particle-reinforced titanium matrix composite TP-650 was investigated under room temperature tensile conditions. The quasi-static and dynamic tensile properties of the TP-650 composite were compared with those of the matrix. The morphologies of fracture surfaces of both the matrix and the composite were observed by scanning electron microscopy (SEM). The result shows that the strain rates exert complex effects on the mechanical behavior of particle-reinforced titanium matrix composite. Under the quasi-static conditions, both the behaviors of the matrix and the composite are similar to those of the ideal elastic-plastic materials. The composite has better reinforcing effect than the matrix due to the addition of the TiC particles. While under the high strain rate, the mechanical characteristics of the composite are not obviously superior to those of the matrix, and the composite shows a higher brittleness than the matrix. The composite and matrix do not show monotonic strain-rate effect under different strain rates.
Key words: TiC; titanium matrix composite; TP-650 titanium matrix composite; strain rate effect; tensile fracture
