(上海交通大学 金属基复合材料国家重点实验室，上海 200240)
摘 要: 利用Ti和LaB6之间的化学反应，采用真空自耗电弧炉3次重熔制得TiB和La2O3增强的钛基复合材料，测得其相变点为1 045 ℃，然后经高温(1 100~1 050 ℃)锻造成板坯。在1 010 ℃对材料进行热轧，然后空冷，利用光学显微镜和扫描电镜研究变形量分别为40%、60%、80%、90%和95%时复合材料的显微组织和拉伸试样断口形貌。结果表明：当变形量到达到80%时，材料的强度一直上升，伸长率下降；变形量继续增大后，强度有所下降，伸长率提高。
关键字: 钛基复合材料；热轧；变形量；显微组织；室温力学性能
（State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:Utilizing the reaction between Ti and LaB6, titanium matrix composite (TMC) plate reinforced with TiB and La2O3 was prepared by casting trice and hot-forging, its transformation temperature measured was 1 045 ℃. The TMC was rolled at 1 010 ℃, then air-cooled. The microstructure and fracture surfaces were studied by OM and SEM at deformation amount of 40%, 60%, 80%, 90% and 95%. The results show that when the deformation amount reaches 80%, the strength of the composite material keeps on increasing, whereas the elongation decreases. However, if the deformation amount increases more, the strength of the material decreases slightly, and the elongation increases.
Key words: titanium matrix composite; hot-rolling; deformation amount; microstructure; room-temperature mechanical properties
