【作者】 卢俊强； 覃继宁； 吕维洁； 张荻； 侯红亮；

【Author】 Lu Junqiang~1,Qin Jining~1,Lu Weijie~(1*),Zhang Di~1,Hou Hongliang~2 1.State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200030,China 2.Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China

【机构】 上海交通大学金属基复合材料国家重点实验室； 北京航空制造工程研究所；

【摘要】 通过真空自耗电弧熔炼的方法制备了体积分数为5%的TiB和TiC共同增强的Ti-6Al-4V基复合材料。高温置氢后获得了氢含量为0wt.%、0.15wt.%和0.60wt.%的复合材料。在相同条件下(始锻1000℃,终锻880℃,变形量70%)进行高温锻造。真空退火后进行了室温和高温(400℃)力学性能测试。结果显示,对于氢含量为0.15wt.%的复合材料,热氢处理后室温和高温力学性能与原始材料相比变化不大;而氢含量为0.60wt.%的复合材料热氢处理后,室温和高温力学性能均显著提高,抗拉强度分别提高了100MPa和150MPa,室温塑性则几乎没有降低。大量β相在真空退火时分解而使组织细化是钛基复合材料力学性能提高的主要原因。更多还原

【Abstract】 (TiB+TiC)/Ti-6Al-4V composite were fabricated and hydrogenated.The composite with hydrogen concentrations 0 wt.%,0.15 wt.%,0.60 wt.%were obtained.The composites were all forged at the same condition(starting forging temperature 1000℃,final forging temperature 880℃,the deformation reduction 70%).After vacuum annealing,the tensile testing at room temperature and high temperature(400℃) was carried out.Also,the microstructures in the whole procedure were observed.The results showed that the mechanical properties changed little when thermohydrogen at 0.15 wt.%while the ultimate tensile strength enhanced significantly at 0.60 wt.%.The refined microstructure induced by decomposition ofβphase enriched with hydrogen during vacuum annealing was the main reason for the enhanced mechanical properties.更多还原