(1. 太原理工大学，材料科学与工程学院，太原 030024；
2. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 采用原位熔铸的方法制备了3%(TiB+TiC)/Ti复合材料。用X射线分析(XRD)和能谱(EDS)进行了相分析，用金相显微镜(OM)和扫描电镜(SEM)研究了锻造对复合材料组织的影响，并对铸态和锻造后的复合材料进行了高温拉伸对比试验。结果表明，利用该方法制备的复合材料中增强体分布均匀，锻造后复合材料由等轴状的α晶粒构成；与铸态复合材料相比，锻态复合材料在600~800 ℃范围具有较高的抗拉强度和伸长率；锻造对复合材料的高温断裂方式也有明显的影响。
关键字: 钛基复合材料；原位自生；高温锻造；显微组织；高温拉伸性能
（1. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:3% (volume fraction) (TiB+TiC)/Ti composite was fabricated using in-situ technology. The microstructure of the composite as-cast and after forging was studied by optical microscopy (OM). The phase identification was performed by X-ray and energy dispersion X-ray spectrometer (EDS). The mechanical properties of the composite in cast and after forging were tested by tensile tests at high temperature. The results show that the microstructure of the composite after forging consists of near equiaxed α grains totally. Compared with the as-cast composites, as-forged composites possess excellent high temperature tensile strength and elongation in 600-800 ℃ temperature range. Forging has obvious effect on the fracture mode and fracture process of the composite as well.
Key words: titanium matrix composites; in situ; high temperature forging; microstructure; high temperature tensile properties
