微纳米颗粒增强TiAl基复合材料组织与室温力学性能  

Microstructure and Mechanical Properties of Micro-nano Particles Reinforced TiAl Matrix Composites at Room Temperature

作　　者：马腾飞 王玉鹏 荣光飞 霍望图 刘承泽 张于胜 王晓红 董多[1] 朱冬冬[1] Ma Tengfei;Wang Yupeng;Rong Guangfei;Huo Wangtu;Liu Chengze;Zhang Yusheng;Wang Xiaohong;Dong Duo;Zhu Dongdong(Key Laboratory of Air-driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,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]衢州学院浙江省空气动力装备技术重点实验室,浙江衢州324000 [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,陕西西安710016

出　　处：《稀有金属材料与工程》2023年第5期1877-1884,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52001262,52071188,52171120);浙江省自然科学基金(ZY22E010293,LQ20E010003)。

摘　　要：原位自生颗粒增强金属基复合材料是提高金属材料强韧性的有效途径,采用放电等离子烧结技术(SPS),以氧化石墨烯、碳化硅、氮化硼为增强体,原位自生制备TiAl基复合材料,研究第二相对TiAl基复合材料显微组织演变及室温性能的影响。结果表明,增强体的改变直接影响了TiAl基复合材料第二相形貌和分布。添加石墨烯在TiAl合金α2和γ片层界面处弥散析出微纳米尺度第二相Ti_(2)AlC;添加碳化硅在基体中分别生成微米级晶界相Ti_(5)Si_(3),微纳米片层间相Ti_(2)AlC;添加氮化硼未能在TiAl合金α2和γ片层界面处析出微纳米第二相,而是纳米级TiB2和Ti_(2)AlN相析出在晶界处与基体形成连续核壳结构;复合添加石墨烯和氮化硼既能在片层间原位析出Ti_(2)AlC相,又能在晶界处形成核壳结构。TiAl基复合材料的室温压缩性能和摩擦磨损性能均得到有效提高,复合添加石墨烯和氮化硼可获得优异的室温力学性能。TiAl基复合材料的析出相调控为合金设计提供了新思路,有望进一步突破TiAl合金性能极限。The mixed powders of Ti-48Al-2Nb-2Cr alloy with multilayer graphene oxide,SiC particles and BN nanosheets were sintered by spark plasma sintering(SPS)at 1300℃,and the effects of different additive powders on microstructure evolution and properties of TiAl composites were investigated.The results show that the microstructure of composites is significantly changed with the addition of different additive powders.The micro-nano Ti_(2)AlC precipitates in-situ at the interface ofα2 lath andγlath of TiAl matrix after adding graphene.While a microstructure composed of networked core-shell(CS)structured forms in TiAl matrix with the addition of SiC particles and BN nanoplatelets.Moreover,Ti_(2)AlC can be precipitated in situ and CS structure can be formed by adding graphene and BN nanoplatelets simultaneously.The present results exhibit that the microstructure of TiAl composites can be designed by changing the additive powder.

关 键 词：复合材料 TIAL合金 SPS 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]