应变率对TB17钛合金亚稳β晶粒变形机制的影响  

Effect of strain rate on deformation mechanism of metastableβgrains in TB17 titanium alloy

作　　者：信云鹏 朱知寿 王新南 商国强 祝力伟 李明兵 李静 刘格辰 XIN Yun-peng;ZHU Zhi-shou;WANG Xin-nan;SHANG Guo-qiang;ZHU Li-wei;LI Ming-bing;LI Jing;LIU Ge-chen(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095

出　　处：《材料工程》2020年第12期141-147,共7页Journal of Materials Engineering

摘　　要：采用光学显微镜(OM),电子背散射衍射(EBSD)和透射电子显微镜(TEM)研究不同应变率(0.001,1,3×10^3 s^-1)加载对TB17钛合金亚稳β晶粒变形机制的影响。结果表明:亚稳β晶粒对应变率的敏感性较高,应变率为1 s^-1时合金的抗压强度较应变率为0.001 s^-1时提高约25%,在应变率为3×10^3 s^-1的动态加载下,合金抗压强度也有较大幅度的提升;在较低应变率(<1 s^-1)加载变形时,主要以滑移变形为主,并在滑移线周围形成小角度晶界;在较高应变率(3×10^3 s^-1)加载变形时,主要发生应力诱发马氏体相变。The effect of different strain rates(0.001,1,3×10^3 s^-1)on metastableβgrain deformation mechanism of TB17 titanium alloy was studied by optical microscope(OM),electron backscattered diffraction(EBSD),and transmission electron microscope(TEM).The results show that metastableβgrains are highly sensitive to strain rate.The compressive strength of the alloy at strain rate of 1 s^-1 is about 25%higher than that at strain rate of 0.001 s^-1.Under dynamic loading with strain rate of 3×103 s^-1,the compressive strength of the alloy is also greatly improved.At lower strain rate(<1 s^-1),slip is the main deformation mechanism and small angle grain boundaries are formed around slip lines.At high strain rate(3×10^3 s^-1),the main deformation mechanism is stress-induced martensitic transformation.

关 键 词：应变率 TB17钛合金 滑移变形 应力诱发马氏体相变 

分 类 号：TG146.23[一般工业技术—材料科学与工程]