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首页> 外文期刊>Powder Metallurgy >Comparison of flow and shear band structures in oriented, columnar tungsten, single crystal tungsten-tantalum and sintered tungsten heavy alloy ballistic penetrators
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Comparison of flow and shear band structures in oriented, columnar tungsten, single crystal tungsten-tantalum and sintered tungsten heavy alloy ballistic penetrators

机译：定向柱状钨，单晶钨钽和烧结钨重合金弹丸穿透器流动和剪切带结构的比较

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摘要

The penetration of long rods (L/D approx=10) into standard RHA targets differs with rod failure and flow, which produces erosion and deceleration. Oriented, columnar grained W and [001] single crystal W-4 percent Ta rods exhibit dense shear/shear band flow phenomena consisting of overlapping bands of predominantly dynamically recrystallised (DRX) grain structures observed by optical metallography and transmission electron microscopy. This flow is contrasted with WHA (93 percent W, 5 percent Ni, 2 percent Fe) sintered rod penetration characterised by penetrator nose failure in blocks which move on narrow shear bands between the blocks and function like microstructural lubricants. From these comparative observations of residual, penetrated rods, strategies to promote rod penetration seem to involve the development of wide, overlapping bands or layers of equiaxed or preferentially oriented, refined microstructures, which facilitate material flow at high strain rates. Micro-structural precursors, such as deformation twinning or the enhancement of recrystallisation or related micro-structural issues, promoting frequent or overlapping shear bands, either through alloying or processing routes to control the shear instabilities, seem to provide the best strategies to enhance long rod penetration.
机译：长杆（L / D大约= 10）进入标准RHA目标的穿透力因杆的失效和流动而不同，这会导致腐蚀和减速。定向的柱状晶粒W和[001]单晶W-4％Ta棒表现出致密的剪切/剪切带流动现象，该现象由光学金相学和透射电子显微镜观察到的主要是动态重结晶（DRX）晶粒结构的重叠带组成。这种流动与WHA（93％W，5％Ni，2％Fe）的烧结棒渗透率形成鲜明对比，其特点是块体中的穿透头断裂，这些块体在块体之间的窄剪切带上移动，其功能类似于微结构润滑剂。从对残留的渗透棒的这些比较观察中，促进棒渗透的策略似乎涉及发展宽的，重叠的条带或层的等轴或优先取向的精制微结构，这些结构或材料有助于高应变速率下的材料流动。微观结构的前体，例如变形孪晶或增强再结晶或相关的微观结构问题，通过合金化或加工路线来控制剪切不稳定性，促进频繁或重叠的剪切带，似乎是增强长棒的最佳策略渗透。

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