TC6钛合金不同组织绝热剪切带的形成机理

Formation Mechanics of Adiabatic Shear Band for the Different Microstructures of TC6 Alloy

摘要:

采用分离式Hopkinson Bar技术对TC6钛合金等轴组织及网篮组织试样进行了动态剪切试验，通过光学显微镜、扫描电镜及透射电镜研究了TC6钛合金2种组织绝热剪切带的形成机理。结果表明：由于组织状态不同，其绝热剪切带的形成机理也不同；等轴组织绝热剪切带的形成是位错增殖、运动及塞积的结果，而网篮组织绝热剪切带的形成则是动态再结晶的结果。

Abstract:

Dynamic shearing experiment has been done for TC6 titanium alloy by using the technology of split Hopkinson bar. The formation mechanics of adiabatic shear band of TC6 titanium alloy have been studied by optical microscope (OP), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It is shown that the formation mechanics of adiabatic shear band are different due to the different microstructures for the TC6 titanium alloy. To the spherical equiaxed microstructures, its formation of shear band is due to the multiplication, moving and clogging of dislocation; and to the lamellar microstructures, the formation of shear band is due to the dynamic recrystallization.