时效温度对原位TiB+TiC复相增强钛基复合材料组织和性能的影响  

Effects of Aging Temperature on Microstructure and Properties of In-Situ Hybrid Ti Matrix Composites with TiB and TiC Reinforcements

作　　者：程婧璠[1,2] 杨松峰[1] 陈霏 赵炳怡 徐灿 蔡启舟 Cheng Jingfan;Yang Songfeng;Chen Fei;Zhao Bingyi;Xu Can;Cai Qizhou(State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology;School of Mechanical Engineering,Wuhan Vocational College of Software and Engineering)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074 [2]武汉软件工程职业学院机械工程学院

出　　处：《特种铸造及有色合金》2020年第8期819-823,共5页Special Casting & Nonferrous Alloys

摘　　要：研究了时效温度对SPS原位合成的TiB+TiC复相增强Ti-6Al-4V复合材料组织和性能的影响。结果表明,在673~873 K的温度范围时效处理时,随时效温度升高,固溶处理的马氏体逐渐分解,形成弥散点状α+β组织,当时效温度超过823 K后,β相粗化。在773 K时效时复合材料的力学性能最佳,其压缩强度、屈服强度和工程应变分别为1970、1632 MPa和15.2%。复合材料的硬度随时效温度的升高而降低。随着磨损载荷增加,复合材料的摩擦因数降低,磨损失重逐渐升高;低载荷时主要发生磨粒磨损,当载荷为50 N时其磨损机制为磨粒磨损和氧化磨损共同作用。Effects of ageing temperature on the microstructure and properties of in situ hybrid Ti-6 Al-4 V composites with TiB and TiC reinforcements were investigated.The results show that,with the increase of 673~873 K aging temperature,the martensite formed during solid solution treatment is decomposed gradually and transform toβphase with dispersive distribution andαphase.When the aging temperature is higher than 823 K,theβphase is coarsened.The mechanical properties of the composites aged at 773 K present the acceptable data,where the compressive strength,yield strength and engineering strain reach 1970 MPa,1632 MPa and 15.2%,respectively.The Vickers hardness of the composites is decreased with the increase of aging temperature.With the increase of wear loads,the friction coefficient of the composites is decreased and the wear loss is increased gradually.The wear mechanism under low load is characterized by abrasive wear,while the wear mechanism is characterized by co-action of abrasive wear and oxidation wear with the load of 50 N.

关 键 词：钛基复合材料 时效温度 压缩性能 摩擦因数 磨损失重 

分 类 号：TB331[一般工业技术—材料科学与工程] TG146.23[金属学及工艺—金属材料]