显微组织对Ti-3Al-4.5V-5Mo钛合金拉伸变形行为的影响  

Effect of microstructure on tensile deformation behavior of Ti-3Al-4.5V-5Mo titanium alloy

作　　者：李兴无 沙爱学 陈勃 储俊鹏 LI Xingwu;SHA Aixue;CHEN Bo;CHU Junpeng(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：《航空材料学报》2020年第5期45-52,共8页Journal of Aeronautical Materials

摘　　要：利用扫描电镜、X衍射仪和理论计算研究不同晶粒尺寸、晶体取向对Ti-3Al-4.5V-5Mo钛合金拉伸行为的影响。不同状态的合金丝材拉伸实验结果验证了在720~840℃退火后的拉伸真应力-真应变曲线上存在明显的宏观屈服点,屈服后出现应力跌落;在α相晶体取向均为<0001>丝织构特征时,晶粒尺寸的大小决定合金的宏观屈服强度,晶粒尺寸越大,宏观屈服强度越小;相对于<0001>丝织构,α相<>丝织构的存在导致α相中产生较大的塑性变形,β相中内应力增加,合金宏观屈服强度降低。The effect of grain size and crystal orientation on the tensile deformation behavior of Ti-3Al-4.5V-5Mo titanium alloy was studied by using scanning electron scanning electron,X diffraction instrument and theoretical calculation.The results of tensile test of the wires in different states have verified that there are obvious macroscopic yield points on true stress-true strain curves of 720-840℃annealing structures,and then a stress drop occurs.When the crystal orientation ofαphase all shows<0001>fiber texture of different wires,the grain size determines the macroscopic yield stress of the wire.The larger the grain size is,the lower macroscopic yield stress is.Compared with<0001>fiber texture,the existence of<>fiber texture ofαphase generates larger plastic deformation inαphase,the internal stress inβphase,increased,and the macroscopic yield strength of the alloy decreased.

关 键 词：延性两相合金 变形行为 Ti-3Al-4.5V-5Mo 内应力 显微组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]