Effect of rhenium addition on microstructure and mechanical properties of Ti−48Al−2Cr−2Nb alloys  

铼添加对Ti-48Al-2Cr-2Nb合金显微组织和力学性能的影响

作　　者：Sheng-hang XU Jun-jie LAN Meng HAN Hui-bin ZHANG Kai-jie SHEN Jun-pin LIN Hua-zhen CAO Guo-qu ZHENG 徐圣航;兰俊杰;韩梦;张惠斌;沈凯杰;林均品;曹华珍;郑国渠(浙江工业大学材料科学与工程学院,杭州310014;中南大学粉末冶金国家重点实验室,长沙410083;浙大城市学院先进材料增材制造创新研究中心,杭州310015;北京科技大学新金属材料全国重点实验室,北京100083)

机构地区：[1]College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [3]Advanced Materials Additive Manufacturing Innovation Research Center,Hangzhou City University,Hangzhou 310015,China [4]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期474-485,共12页中国有色金属学报(英文版)

基　　金：Natural Science Foundation of Zhejiang Province,China(No.LQ21E040004);National Natural Science Foundation of China(No.52271040);State Key Lab of Advanced Metals and Materials,China(No.2021-Z03);State Key Laboratory of Powder Metallurgy,Central South University,China。

摘　　要：The refractory metal rhenium(Re),with content of 0−2 at.%,was introduced into a typicalγ-TiAl alloy of Ti−48Al−2Cr−2Nb(at.%)through vacuum arc melting.The effect of Re content on the microstructure and mechanical properties of theγ-TiAl alloy was investigated.The results show that theγ-TiAl−xRe alloy is composed ofγ,α2,andβphases.As the Re content increases,the proportion ofβphase increases,while the content and size ofα2+γlamellar structure decrease gradually.Furthermore,the compressive strength increases with increasing Re content.A maximum compressive strength of 2282 MPa is achieved for theγ-TiAl−2Re alloy.Theγ-TiAl−2Re alloy exhibits a fracture strain of 36.7%,considerably higher than that of theγ-TiAl alloy(31.0%).Moreover,compared with theγ-TiAl alloy,the hardness and compressive strength of theγ-TiAl−2Re alloy considerably increase by 17.5%and 34.2%,respectively.通过真空电弧熔炼方法在Ti-48Al-2Cr-2Nb合金中加入含量为0-2%(摩尔分数)的难熔金属铼(Re),研究Re含量对γ-TiAl-xRe合金显微组织和力学性能的影响规律。结果表明:γ-TiAl-xRe合金由γ、α_2和β相组成,且随着Re含量的增加,β相的比例增加,α_2+γ片层结构的含量和尺寸逐渐减小。γ-TiAl合金的抗压强度随Re含量的增加而提高,γ-TiAl-2Re合金的抗压强度最高,达到2282 MPa。同时,γ-TiAl-2Re合金的断裂应变为36.7%,明显高于γ-Ti Al合金的断裂应变(31.0%)。此外,与γ-TiAl合金相比,γ-TiAl-2Re合金的硬度和抗压强度分别提高了17.5%和34.2%。

关 键 词：γ-TiAl alloy RHENIUM vacuum arc melting lamellar cluster mechanical properties strengthening mechanism 

分 类 号：TG146.23[一般工业技术—材料科学与工程]