金属基复合材料的断裂是塑性加工过程中最常见的失效形式，也是影响此类材料热加工性能的重要因素之一。本项目拟结合金属材料塑性加工理论和损伤失效理论，以TiB+TiC+La2O3三元混杂增强耐热钛基复合材料为研究对象，基于SEM和TEM原位观察实验测试材料在低/高应变速率下的室温失效断裂特征，采用高速摄影测量复合材料高温变形断裂过程和扩展速度，并结合不同热处理工艺揭示复合材料的室温和高温断裂机制以及增强体的断裂特征，阐明多元多尺度增强体断裂方式对材料失效的影响机制，建立多尺度钛基复合材料损伤—断裂演化多参数模型，实现难变形三元混杂增强耐热钛基复合材料组织缺陷的控制，为进一步提高耐热钛基复合材料强韧性提供新的思路，并对其它非连续增强金属基复合材料多尺度增强体损伤断裂行为的研究具有很好的借鉴和理论指导意义。

The fracture behavior of metal matrix composite is the most common failure mode and important factor which influences the hot workability of materials. It is always the focus point for scientists to study the damage and fracture behavior of ceramic particles reinforced metal matrix composites. In this project, the plastic forming and damage failure theory will be combined together, and TiB+TiC+La2O3 tri-reinforced high temperature titanium matrix composites were chosen as the investigated subject., the fracture characteristic of titanium matrix composite could be investigated by SEM and TEM dynamic tensile test. And a high speed photography method will be firstly used to study the high temperature fracture process and crack propagation rate. Meanwhile, the fracture characteristics of the reinforcements and the fracture mechanism at room temperature/high temperature could be revealed by combing with the different heat treatment. From the explanation of the effect of fracture mode on the failure behavior, a controllable microstructure defect method was developed for hybrid reinforced titanium matrix composite. This project will provide a solution to obtain a high integration between strength and plasticity for high temperature titanium matrix composite. It also will offer a good theoretical guidance to the damage and fracture behavior of other metal matrix composites.