CNTs添加量对原位自生Ti_(2)AlC增强Ti-48Al-2Cr-2Nb合金组织与力学性能的影响  

Effect of CNTs Addition on Microstructure and Mechanical Properties of Ti-48Al-2Cr-2Nb Alloy Reinforced by In-situ Ti_(2)AlC

作　　者：唐傅浩 朱冬冬 王晓红[3] 马腾飞 董多 Tang Fuhao;Zhu Dongdong;Wang Xiaohong;Ma Tengfei;Dong Duo(School of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310000,China;Zhejiang Provincial Key Laboratory for Cutting Tools,Taizhou University,Taizhou 318000,China;Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,China)

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310000 [2]台州学院浙江省工量刃具检测与深加工技术研究重点实验室,浙江台州318000 [3]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

出　　处：《稀有金属材料与工程》2024年第7期1917-1927,共11页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52171120,52271106,52071188);浙江省自然科学基金(LZY23E050001)。

摘　　要：采用真空电弧熔炼炉制备了原位自生Ti_(2)AlC增强Ti-48Al-2Cr-2Nb合金,研究了CNTs含量对TiAl基合金的组织演变和力学性能的影响。结果表明,随着CNTs含量的增加,合金的凝固路径向高Al方向移动,γ相含量增多,与此同时片层组织逐渐细化,Ti_(2)AlC的长径比逐渐减小。在固溶强化、细晶强化以及Ti_(2)AlC析出相强化的作用下,合金的力学性能得到显著提高。随着CNTs含量的增加,合金的维氏硬度由3512.3±188.2 MPa提高到了4199.3±226.4 MPa。合金的室温压缩强度和高温压缩强度均随着CNTs含量的增加先增加后减小。当CNTs添加量为1.0%(质量分数)时,其室温压缩强度和最大应变分别达到1890.61 MPa和29.09%,分别提升54.95%和28.31%。在800℃压缩中,合金的硬化和软化效果受CNTs含量影响,1.0%CNTs的合金表现出最高的压缩强度,相比于未添加CNTs时提升约31.42%,而1.5%CNTs的合金在不影响压缩强度的情况下表现出较好的软化效果。Ti-48Al-2Cr-2Nb alloy reinforced by in-situ Ti_(2)AlC was prepared by vacuum arc melting.The effect of CNTs content on the microstructure evolution and mechanical properties of TiAl alloy was investigated.The results show that with the increase in CNTs content,the solidification path of the alloy moves to the direction of high Al and the volume fraction of γ phase increases.Meanwhile,the lamellar structure is gradually refined,and the length-diameter ratio of Ti_(2)AlC gradually decreases.The mechanical properties of the alloy are improved significantly under the action of solid solution strengthening,grain refinement strengthening and Ti_(2)AlC precipitated phase strengthening.With the increase in CNTs content,the Vickers hardness of the alloy increases from 3512.3±188.2 MPa to 4199.3±226.4 MPa.The compressive strength at room temperature and high temperature of the alloy firstly increases and then decreases with the increase in CNTs content.When the addition of CNTs is 1.0wt%,the compressive strength and maximum strain at room temperature reach 1890.61 MPa and 29.09%,which increase by 54.95% and 28.31%,respectively.At 800 ℃,the hardening and softening effects of the alloy are affected by the CNTs content.The alloy with 1.0wt% CNTs shows the highest compressive strength,increased by about 31.42% compared with that without CNTs addition,and the alloy with 1.5wt% CNTs shows better softening effect without sacrificing the compressive strength.

关 键 词：TIAL合金 CNTS 组织演变 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]