连续网状结构Ti_(2)AlN/TiAl复合材料的制备及力学性能  

Fabrication and mechanical properties of Ti_(2)AlN/TiAl composite with continuous network structure

作　　者：蒋闽晋 孙红亮[1,2] 刘瑞[1,2] 蒋小松[1,2] 张亚丽 孙大明 Min-jin JIANG;Hong-liang SUN;Rui LIU;Xiao-song JIANG;Ya-li ZHANG;Da-ming SUN(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Chengdu 610031,China;School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Mechanical Engineering,Sungkyunkwan University,2066 Seobu-ro,Jangan-gu,Suwon-si,Gyeonggi-do,16419,Korea;Department of Chemistry and Bioscience,Aalborg University,Aalborg,9220,Denmark)

机构地区：[1]材料先进技术教育部重点实验室,成都610031 [2]西南交通大学材料科学与工程学院,成都610031 [3]School of Mechanical Engineering,Sungkyunkwan University,2066 Seobu-ro,Jangan-gu,Suwon-si,Gyeonggi-do,16419,Korea [4]Department of Chemistry and Bioscience,Aalborg University,Aalborg,9220,Denmark

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第5期1437-1451,共15页中国有色金属学报（英文版）

基　　金：the Cultivation Project for Original Scientific Research Instruments and Equipments of Southwest Jiaotong University,China(No.XJ2021KJZK041);the Key Laboratory of Infrared Imaging Materials and Detectors,Shanghai Institute of Technical Physics,Chinese Academy of Sciences(No.IIMDKFJJ-19-08);the China Postdoctoral Science Foundation(No.2018T110993)。

摘　　要：采用高温气体渗氮法将氮引入TiAl预合金粉末中,然后采用放电等离子烧结法制备具有连续网络增强相结构的Ti_(2)AlN/TiAl复合材料。结果表明,复合材料的硬度明显高于TiAl合金的硬度,并随着氮化时间的增加而增加。该强化效果是粉末渗氮引起的固溶体强化、具有高硬度和弹性模量的连续网状Ti_(2)AlN相以及位错密度增加协同作用的结果。同时,与TiAl合金相比,Ti_(2)AlN/TiAl复合材料的抗压强度降低,这与氮化后直接形成的一部分Ti_(2)AlN颗粒和过多的增强相含量有关。Nitrogen was introduced into TiAl pre-alloyed powder using high-temperature gas nitriding,and Ti_(2)AlN/TiAl composites with a continuous network structure of the reinforced phase were prepared via spark plasma sintering.The results show that the hardness of the composite is significantly higher than that of TiAl alloy,and increases with the increase of nitriding time.The strengthening effect is originated from the synergistic effect of the solid-solution strengthening caused by the nitriding of the powder,the continuous network of the Ti_(2)AlN phase with high hardness and elastic modulus,and the increase of dislocation density.Additionally,the compressive strength of the Ti_(2)AlN/TiAl composites is lower than that of the TiAl alloy,which is related to a part of Ti_(2)AlN particles that are directly formed after nitriding and excessive reinforcement content.

关 键 词：预合金粉末 渗氮 Ti_(2)AlN/TiAl复合材料 连续网状结构 显微组织 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]