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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 evolution of the microstructure of depleted uranium under the impact of a steel bomb at a pressure of 50 m / s was studied by means of laser confocal, backscatter diffraction, transmission electron microscopy and microindentation. The results show that the depleted uranium will form a spherical crown crater under the impact of a steel bomb. The diameter and depth of the crater are 5.45 and 1.01 mm respectively. From the edge of the crater to the inside of the matrix, the deformed tissue can be divided into four regions: twinning zone, high-density twin zone, low-density twin zone and matrix zone. The main plastic deformation mode of depleted uranium during dynamic deformation is twins. In addition to twins, dislocation slip plays an important role in coordinating plastic deformation. Finally, the evolution of the microstructure of depleted uranium under high-speed impact conditions is proposed.