通过激光共聚焦、背散射衍射、透射电子显微镜和显微压痕相结合的技术研究贫铀在钢弹50 m/s撞击下显微组织的演变过程.结果表明,贫铀在钢弹撞击下会形成球冠状弹坑,弹坑直径和深度分别为5.45和1.01 mm.从弹坑边沿到基体内部,变形组织可划分为4个区域:孪晶碎化区、高密度孪晶区、低密度孪晶区和基体组织区.贫铀在动态变形过程中的主要塑性变形方式是孪生.除孪生外,位错滑移在协调塑性变形时也发挥着重要作用.最后,提出贫铀在高速撞击条件下显微组织的演变过程.
The deformed microstructure evolution of depleted uranium impacted by steel projectile at a velocity of 50 m/s was investigated by means of confocal laser scanning microscope, electron backscatter diffraction, transmission electron microscope and indenter technique. The experimental results showed that the spherical cap crater was formed in depleted uranium target impacted by steel projectile, and the diameter and depth of the impacted crater were 5.45 and 1.01 mm, respectively. From crater rim to deep matrix, four deformed zones were classified, including twin fragmentation zone, high density deformation twin zone, low density deformation twin zone and matrix zone. Twinning was considered as the dominant plastic deformation mechanism of depleted uranium subjected to impact loadings. Besides twinning, the dislocation slipping also played an important role to accommodate the plastic deformation. Finally, the deformed microstructure evolution of depleted uranium under high velocity impact was proposed.
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