时效处理对Ti-6Al-3Nb-2Zr-Mo合金组织演变和力学性能的影响  

Effects of Aging Treatment on Microstructure Evolution and Mechanical Properties of Ti-6Al-3Nb-2Zr-Mo Alloy

作　　者：江海洋 江福清[2,3] 王冰 徐斌[1,3] 孙明月[1,3] Jiang Haiyang;Jiang Fuqing;Wang Bing;Xu Bin;Sun Mingyue(Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所核材料与安全评估重点实验室,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016 [3]中国科学院金属研究所沈阳材料科学国家实验室,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2023年第6期2002-2009,共8页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program(2018YFA0702900);National Natural Science Foundation of China(52173305,52101061,52233017,52203384);Strategic Priority Research Program of the Chinese Academy of Sciences(XDC04000000);China Postdoctoral Science Foundation(2020M681004,2021M703276);IMR Innovation Foundation(2022-PY12);Ling Chuang Research Project of China National Nuclear Corporation;Youth Innovation Promotion Association,CAS。

摘　　要：为了解不同时效参数对Ti-6Al-3Nb-2Zr-Mo(Ti6321)合金组织和力学性能影响的根本原因,通过光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和力学性能测试,研究了不同时效条件(500~650℃,3~24 h)下的显微组织和力学性能。结果表明,次生相α(α_(s))比初生相α(α_(p))对时效参数更为敏感。此外,α_(s)相的厚度与时效温度和时效时间呈正相关。随着时效温度和时效时间的增加,Ti和Al元素在β_(t)相中的偏析明显,α_(s)相由细针状转变为长棒状。当合金在600℃时效12 h时,合金表现出较好的综合力学性能。抗拉伸强度、屈服强度和伸长率分别为907 MPa、796 MPa和16%,冲击功为55 J。In order to understand the influence of the different aging parameters on the microstructure and mechanical properties of Ti-6Al-3Nb-2Zr-Mo(Ti6321)alloy,the microstructures and mechanical properties under different aging parameters(temperatures ranging from 500℃ to 650℃,3–24 h)were investigated by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and mechanical properties tests.The results reveal that the secondaryα_(p)hase(α_(s))is more sensitive to the aging parameters than the primaryα_(p)hase(α_(p)).Moreover,the thickness ofα_(s) phase is positively correlated with aging temperature or aging time.As the aging temperature and aging time increase,the segregation of Ti and Al elements in theβtransformation phase(β_(t))becomes obvious,and theα_(s) phase changes from fine needle-like to long rod-like.When the alloy is aged at 600℃ for 12 h,the alloy shows good comprehensive mechanical performance.The tensile strength,yield strength,and elongation are 907 MPa,796 MPa,and 16%,respectively,and the impact energy is 55 J.

关 键 词：Ti-6Al-3Nb-2Zr-Mo钛合金 时效处理 微观结构演化 力学性能 

分 类 号：TG156.92[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]