(湖南大学机械与汽车工程学院， 长沙 410082)
摘 要: 采用XD法与搅拌铸造技术相结合的工艺制备了TiCp/ZA43复合材料，其中TiC粒子的尺寸为0.5～1.5 μm，在基体中分布均匀。对TiCp/ZA43复合材料室温至250 ℃温度范围的力学性能进行了测试， 获得了该复合材料的应力-应变曲线及力学性能与温度的关系， 并对其高温拉伸断口进行了分析。结果表明： TiC粒子提高了材料的强度，尤其是显著提高了高温强度；TiCp/ZA43复合材料的断裂方式与拉伸温度有关， 在250 ℃时呈现塑性断裂。
关键字: 复合材料 TiCp/ZA43 高温力学性能 断裂
（School of Mechanical and Automobile Engineering,Hunan University, Changsha 410082, P. R. China）
Abstract:TiCp/ZA43 composites was successfully prepared by combining advantages of XD and stirring-casting techniques. The microstructures of TiCp/ZA 43 composites exhibited a uniform dispersion of TiC particles with size of 0.5～1 .5 μm in matrix. The tensile properties of TiCp/ZA43 composites at ambient and elevated(to 250 ℃) temperatures were studied. The stress-strain plots varies with temperature and the relationship between the mechanical properties of the composites and temperature were obtained. The results showed that TiC particles remarkably improve the strength of the composites at room and elevated temperatures, and the fracture modes of the composites are dependent on temperature, at about 250 ℃, the composite has high plasticity.
Key words: composites TiCp/ZA43 mechanical property at elevated temperature fracture
