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Microstructural modifications in alpha-brass targets after small charge explosions

机译:小型炸药爆炸后α-黄铜靶材的微观结构改性

摘要

Metals exposed to explosions undergo several macro and micro changes. At the microstructural level slip bands or mechanical twins, caused by the pressure and temperature wave, can be detected. Twinning or slip occurs depending on the metal stacking fault energy, the blast wave pressure and the deformation rate. An experimental campaign was performed on different FCC metals. Results concerning a-brass (30% Zn) are presented herein. Specimens exposed to small charge explosion (100 g of plastic explosive) were analyzed by optical and electronic microscopy, by Electron Back-Scattered Diffraction (EBSD) imaging, and by X-ray diffraction. Microstructural plastic deformation marks were detected and their possible attribution, either to mechanical twinning or to cross slip, is discussed on the basis of X-ray diffraction and EBSD results. The detectability target-to-charge distance limit, and hence the critical stress for microstructural changes, are evaluated, (C) 2008 Elsevier Ltd. All rights reserved.
机译:暴露于爆炸的金属会发生一些宏观和微观的变化。在微观结构水平,可以检测到由压力和温度波引起的滑动带或机械孪晶。根据金属堆垛层错能,爆炸压力和变形率,会发生孪生或滑移。在不同的FCC金属上进行了实验。本文介绍了有关α-黄铜(锌含量为30%)的结果。通过光学和电子显微镜,电子背散射衍射(EBSD)成像和X射线衍射分析暴露于小电荷爆炸(100克塑料炸药)的样品。检测了微结构塑性变形痕迹,并根据X射线衍射和EBSD结果讨论了它们的可能归因于机械孪生或交叉滑移。 (C)2008 Elsevier Ltd.评估了可检测性目标到电荷的距离极限,并因此评估了微结构变化的临界应力。保留所有权利。

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