Abstract
Abstract In order to apply a new high density NiW alloy to hollow kinetic energy penetrators, the mechanical properties of the alloy at high temperature and high strain rate are studied by Hopkinson pressure bar. The results show that the strength of the alloy decreases significantly with the increase of temperature, and the decreasing rate between 900°C to 1200°C is about 4 times that between 25°C to 900°C; the alloy has a strain rate strengthening effect, and the strain rate sensitivity increases with the increase of temperature under dynamic loading; unlike normal metals, the tangent modulus of the alloy does not decrease monotonously with the increase of temperature due to the precipitation of Ni4W phase, the solid solution strengthening mechanism and the dynamic recovery mechanism jointly determine the trend of the tangent modulus.
Published Version
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