Mn含量对Ti_(53)Al_(45)Nb_(2)合金组织和力学性能影响  

Effects of Mn Contents on Microstructure and Properties of Ti_(53)Al_(45)Nb_(2)Alloys

作　　者：况侨 吴鑫林 张海龙 王强[2] KUANG Qiao;WU Xinlin;ZHANG Hailong;WANG Qiang(Aeronautical Military Representatives Office of Army in Zhuzhou,Zhuzhou 412000;School of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081;AECC South Industry Co.,Ltd.,Zhuzhou 410000)

机构地区：[1]陆装驻株洲地区航空军代室,株洲412000 [2]武汉科技大学机械自动化学院,武汉430081 [3]中国航发南方工业有限公司,株洲410000

出　　处：《特种铸造及有色合金》2024年第10期1398-1402,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52001236);华中科技大学材料成形与模具技术全国重点实验室开放基金资助项目(P2022-010)。

摘　　要：采用金相显微镜、X射线衍射仪、拉伸试验机、扫面电镜等手段研究了Mn含量对TiAl合金微观组织和力学性能的影响。结果表明,Ti_(53-x)Al_(45)Nb_(2)Mn_(x)(x=0、1、2.5、4,摩尔分数,%)合金的组成相包括γ-TiAl相和α_(2)-Ti_(3)Al相,添加的Mn元素以固溶原子的形式固溶于合金基体中,引起晶格畸变,导致晶面间距变大。随着x从0增至1,2.5,4,合金片层结构显著细化,片层厚度由(670±120)nm分别降到(610±90)、(580±100)和(540±90)nm。合金的室温压缩屈服强度、抗压强度和断裂应变均随着Mn含量增加先增大后减小,Ti_(51.5)Al_(45)Nb_(2)Mn_(2.5)合金性能最佳,分别达到了930 MPa、1605 MPa和30.4%。相较于未添加Mn的合金,分别提高了32.9%、35.4%和83.1%。Effects of Mn content on microstructure and mechanical properties of TiAl alloy were investigated by OM,X-ray,tensile test and SEM.The results reveal that Ti_(53)Al_(45)Nb_(2)Mn_(x)(x=0、1、2.5、4,molar fraction,%)alloys are composed ofγ-TiAl andα_(2)-Ti_(3)Al phases.Mn is dissolved in the alloy matrix in form of solid solution atom,inducing lattice distortion,thus leading to a larger interplanar spacing.With the increase of Mn contents,the lamellar structure is significantly refined,and the lamellar thickness is decreased from(670±120)nm to(610±90)nm,(580±100)nm and(540±90)nm,respectively.The compressive yield strength,compressive strength and fracture strain of alloys at room temperature are firstly increased and then decreased with the increase of Mn contents,which are 930 MPa,1605 MPa,and 30.4%,increased by 32.9%,35.4%and 83.1%compared with those of Mn-free TiAl alloy,respec⁃tively,indicating desirable properties.

关 键 词：TIAL合金 Mn合金化 微观组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]