Micro-damage behaviors of Al–6Mg alloy impacted by projectiles with velocities of 1–3.2 km/s
作者： L. Zhen , G.A. Li , J.S. Zhou , D.Z. Yang
DOI: 10.1016/J.MSEA.2004.09.016
关键词:
摘要: Abstract Microstructure changes and micro-damage behaviors of a Al–6Mg alloy under the impact GCr15 steel projectiles have been studied by optical microscope, scanning electron microscope (SEM) transmission (TEM). The results show that dynamic recrystallization in material just adjacent to crater can be induced hypervelocity impact. Dislocation cells formed during process act as nuclei recrystallization, temperature rising caused heat transformed from adiabatic plastic deformation work offers condition for recrystallization. degree depends on velocity. Three kinds micro-damages: micro-cracks, microvoids shear bands, region around are usually produced impacts. When velocity is lower, grains within bands obviously fragmentated, when higher, whirlpool-like wavy ones near wall bottom, respectively. Micro-cracks front band, observed propagate along bands. Microvoids ahead micro-cracks.
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