On the behaviour of body-centred cubic metals to one-dimensional shock loading |
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Authors: | J C F Millett N K Bourne N T Park G Whiteman G T Gray III |
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Affiliation: | (1) AWE, Aldermaston, Reading, RG7 4PR, United Kingdom;(2) MST-8, Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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Abstract: | The response of metallic materials to shock loading, like all loading regimes, is controlled largely by factors operating
at the microscopic or atomic levels. Over the past few years, face-centred cubic (fcc) metals have received a level of attention
where the role of features such as stacking fault energy and precipitation hardening have been investigated. We now turn our
attention to body-centred cubic (bcc) metals. In the past, only tantalum, tungsten, and their alloys have received significant
attention at high strain-rate conditions due to their use by the ordnance community. In particular, this investigation examines
the shear strength of these materials at shock loading conditions. Previous results on tantalum, tungsten, and a tungsten
heavy alloy are reviewed, and more recent experiments on niobium, molybdenum, and Ta–2.5 wt% W presented. Results are discussed
in terms of known deformation mechanisms and variations of Peierl’s stress. |
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