论文部分内容阅读
利用分离式Hopkinson压杆,对Ti5Mo5V2Cr3Al(TB10)合金帽形试样进行强迫剪切试验,通过光学显微镜和透射电镜技术观测其绝热剪切带(ASB)内的微观结构。结果表明,ASB的过渡区由具有高位错密度的沿着剪切方向的宽度为20～50nm的拉长组织构成;剪切带中心由大量低位错密度(相对ASB的过渡区)的直径为50～100nm的晶粒组成,具有典型的再结晶组织特征。在绝热剪切变形过程中ASB内的平均绝热温升约为784℃。ASB内发生了动态再结晶,晶粒尺寸为50～100nm。
The forced shear test was carried out on the Ti5Mo5V2Cr3Al (TB10) alloy cap by means of a split Hopkinson pressure bar. Microstructures in the adiabatic shear band (ASB) of the Ti5Mo5V2Cr3Al (TB10) alloy were observed by light microscopy and transmission electron microscopy. The results show that the transition zone of ASB is composed of elongated structure with 20-50nm width along the shear direction with high dislocation density. The center of the shear zone is composed of a large number of low dislocation density (transition zone relative to ASB) of 50 ~ 100nm grain composition, with a typical recrystallization microstructure. The average adiabatic temperature rise in the ASB during adiabatic shear deformation is about 784 ° C. Dynamic recrystallization occurred in the ASB with a grain size of 50-100 nm.