Al-5.9Cu合金经过495 m/s穿甲燃烧弹侵彻后,弹坑底部呈现锯齿状,形成了两种形变带,一种与滑移带有相似的形貌,另一种与晶体的流态变形方向平行,弹坑侧壁形成剪切带以及撕裂性形变带。在809 m/s穿甲燃烧弹的冲击条件下,形成了螺旋状和涡流状的剪切带。两种冲击速度下,弹坑周围都形成了大量的微带。分析认为,在高速冲击压力下,产生了局部应力集中,位错的极化,中部位错的湮灭,以及形成了二次位错,最终形成微带组织。 Al-5.9Cu alloy after penetration of 495 m / s armor-piercing combustion projectile, the bottom of the crater was jagged, forming two deformation bands, one with slip with a similar morphology, and the other with the crystal flow State parallel to the deformation direction, crater sidewall shear zone and tearing deformation zone. Under the impact of the penetration armor at 809 m / s, helical and vortex shear bands were formed. At both impact velocities, a large number of microstrips are formed around the crater. The analysis shows that under high-speed impact pressure, local stress concentration, dislocation polarization, annihilation of central dislocations, and the formation of secondary dislocations eventually lead to the formation of microstrip structures.