烧结温度对TiAl基复合材料组织与性能的影响  

Effect of Sintering Temperature on Microstructure and Properties of TiAl Composites

作　　者：王玉鹏 马腾飞 刘跃 刘承泽 霍望图 张于胜 周廉 Wang Yupeng;Ma Tengfei;Liu Yue;Liu Chengze;Huo Wangtu;Zhang Yusheng;Zhou Lian(School of Material Science and Engineering,Northeast University,Shenyang 110819,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China;Xi’an Rare Metal Materials Institute Co.,Ltd.,Xi’an 710016,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]西北有色金属研究院,陕西西安710016 [3]西安稀有金属材料研究院有限公司,陕西西安710016

出　　处：《钛工业进展》2021年第3期17-22,共6页Titanium Industry Progress

基　　金：陕西省自然科学基础研发计划项目(2020JQ-925)。

摘　　要：采用放电等离子烧结炉在1200~1350℃下对Ti-48Al-2Nb-2Cr预合金粉末和多层氧化石墨烯组成的混合粉末进行烧结,研究了烧结温度对石墨烯增强的TiAl基复合材料组织演变及压缩性能的影响。结果表明,随着烧结温度的升高,复合材料组织由近γ等轴晶组织逐渐向全片层组织转变,在室温下复合材料组织对其抗压强度和断裂应变的影响较小,而在850℃/0.001 s-1压缩条件下,不同组织的复合材料抗压强度和断裂应变发生显著变化,其中1300℃下烧结获得的细小全片层组织具有最高的高温抗压强度和断裂应变。烧结温度对TiAl基复合材料的组织与性能具有重要影响。The mixed powder of Ti-48Al-2Nb-2Cr alloy and multilayer graphene oxide was sintered by spark plasma sintering(SPS)at the temperature range of 1200~1350℃,and the effect of sintering temperature on microstructure evolution and compressive properties of graphene-enhanced TiAl composites was studied.The results show that the microstructure of composites gradually transform from nearγequiaxed crystal to full-lamellae with the increase of sintering temperature.The microstructure has little effect on compressive strength and fracture strain at room temperature,while the compressive strength and fracture strain change significantly at 850℃/0.001 s-1 with different microstructures.And the full-lamellae microstructure obtained by sintering at 1300℃exhibits the highest high-temperature compressive strength and fracture strain.The sintering temperature has an important influence on the microstructure and properties of TiAl composites.

关 键 词：TIAL基复合材料 烧结温度 微观组织 高温压缩 

分 类 号：TB333.12[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]