Ti-5553合金在轻气炮冲击下的变形行为

The deformation behavior of near-β Ti-5553 alloy under the impact of light gas gun

摘要:

利用一级轻气炮装置，以不同速度的飞片对Ti-5553合金进行冲击加载，采用光学显微镜和透射电子显微镜观察并分析微观组织和变形行为，结合XRD和定量金相研究方法进行分析和计算。结果表明，Ti-5553合金在轻气炮冲击下会发生位错滑移、形变孪生和应力诱发马氏体相变（stress-induced martensite，SIM），形成α″相。α″相的生成量受轻气炮冲击速度的影响，随着冲击速度的增大，形成的α″含量呈明显上升趋势，当轻气炮冲击速度由380m/s上升到560m/s时，单位面积α″线的长度LA由39.18mm/mm2上升到52.65mm/mm2。

Abstract:

The deformation behavior of near-β Ti-5553 alloy under the impact of light gas gun has been studied by optical microscopy (OM) combined with quantitative metallographic analysis, transmission electron microscope (TEM) and X-Ray Diffraction (XRD). The experimental results demonstrated that Ti-5553 alloy deform via dislocation slipping，deformation twinning and stress-induced martensite (SIM) phase transformation. Meanwhile, the amount of SIM is influenced by the velocity of flyer plates by which Ti-5553 alloy was impacted. The amount of SIM increased obviously as the impact velocity increased. Particularly, when the velocity increased from 380m/s to 560m/s, the length of the SIM wire per unit area (LA) increased from 39.18mm/mm2 to 52.65 mm/mm2.