Cr和W对TiAl-Nb合金微观组织与力学性能的影响  

Effects of Cr and W on Microstructure and Mechanical Properties of TiAl-Nb Alloys

作　　者：刘桐 蔡小叶 程宗辉 董定平 李晨雨 骆良顺[3,4] 苏彦庆 LIU Tong;CAI Xiaoye;CHENG Zongohui;DONG Dingping;LI Chenyu;LUO Liangshun;SU Yanqing(State-Owned Machinery Factory in Wuhu,Wuhu 241007,China;Anhui Key Laboratory of High-performance Nonferrous Metal Materials,Anhui Polytechnic University,Wuhu 241000,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Anhui HIT3D Additive Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]国营芜湖机械厂,安徽芜湖241007 [2]安徽工程大学高性能有色金属安徽省重点实验室,安徽芜湖241000 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [4]安徽哈特三维科技有限公司,安徽芜湖241000

出　　处：《热加工工艺》2023年第6期40-44,共5页Hot Working Technology

基　　金：国家自然科学基金青年基金项目(52001001);安徽工程大学科研启动基金项目(2020YQQ005);安徽工程大学-繁昌区产业协同创新专项基金项目(2021fccyxta2)。

摘　　要：采用真空电弧非自耗熔炼方法制备了Ti-Al-Nb-xCr-yW-Si(x=1.5、2.5、3.5,y=0.5、1.0、2.0,原子分数,%,下同)合金,研究了随Cr,W元素含量变化,该合金的微观组织与室温/高温的抗压缩力学性能。结果表明:铸态合金的微观组织中主要由片层组织(α_(2)+γ)和γ/B2相组成,随Cr、W元素含量增加,B2相增多,片层组织减少,当Cr、W元素增加至3.5%、2.0%时,合金中出现了粗大的类似羽毛状的组织,Cr元素的β稳定能力要强于W元素。随着Cr元素含量的增加,合金压缩的峰值应力逐渐降低;而随着W元素含量的增加,合金压缩的峰值应力逐渐增加,其中Ti-44Al-5Nb-2.5Cr-1.5W-0.5Si合金具有最高的峰值应力和延展性。Ti-Al-Nb-xCr-yW-Si(x=1.5,2.5,3.5,y=0.5,1.0,2.0,at%)alloys were prepared by vacuum arc melting.The microstructure and compressive mechanical properties of alloys with the change of Cr and W contents were studied.The results show that the microstructure of as-cast alloys is mainly composed of lamellar structure(α_(2)+γ)and B2 phase.With the increase of Cr and W contents,B2 phase increases and lamellar structure decreases.When Cr and W increase to 3.5%and 2.0%,coarse feather like structure appears in alloys.βphase stability of Cr is stronger than that of W element.The peak stress of the alloy in compression decreases with the increase of Cr content,while the peak stress of alloy in compression increases with the increase of W content,and Ti-44Al-5Nb-2.5Cr-1.5W-0.5Si alloy shows the highest peak stress and ductility.

关 键 词：TiAl-Nb合金 合金化 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]