(哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 通过降低钛粉尺寸与增加球磨能量以增大钛粉比表面积，提高网状结构钛基复合材料中最大增强相含量，获得更高的增强效果，并优化烧结温度。组织分析及力学性能测试结果显示：随着烧结温度的提高，TiBw/Ti复合材料致密度提高，TiBw增强相含量增加，力学性能提高，确定1 200 ℃为最佳烧结温度。制备的复合材料存在增强相富集区与增强相贫化区，制备出具有调控组织的12%TiBw/Ti(体积分数)复合材料。其弯曲与压缩屈服强度均超过1 200 MPa，抗拉强度较基体纯Ti的提高136.6%，400 ℃高温压缩屈服强度较纯钛的提高9倍，表现出非常优异的增强效果。
关键字: 钛基复合材料；TiBw；粉末冶金；原位自生；微观组织；力学性能
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The volume fraction of titanium matrix composites was enhanced by decreasing Ti powder size and increasing Ti powder specific surface by enhancing milling energy in order to get higher strengthening effect. Additionally, the sintering temperature was optimized. The results of microstructure and mechanical properties show that the relative density of the TiBw/Ti composites, the volume fraction of TiBw reinforcement and the strength of the composites increase with increasing sintering temperatures. Therefore, the optimal sintering temperature is established to be 1 200 ℃ for the present systerm. TiBw-rich region and TiBw-lean region are still observed in the present composites. These indicate that 12%TiBw/Ti (volume fraction) composites with a tailored microstructure are fabricated. Both the bending yield strength and the compressive yield strength of them are higher than 1 200 MPa. The ultimate tensile strength of the composites increases by 136.6%. Moreover, the compressive yield strength increases by 9 times at 400 ℃. The present composites exhibit a superior strengthening effect.
Key words: titanium matrix composites; TiBw; powder metallurgy; in situ; microstructure; mechanical properties
