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- W2891283378 abstract "In situ straining experiments were carried out in pure tungsten in order to study the geometry and kinetics of glide of dislocations as a function of stress and temperature. For tensile axes different from <110>, screw dislocations move by a combination of steady and jerky motion in planes which cannot be identified unambiguously. For a tensile axis close to <110>, however, screw dislocations have a much jerkier motion with jumps over large distances, in {112} planes exactly but only in the twinning direction, and in {123} planes. This involves a strong violation of the Schmid law, in agreement with slip line observations reported in the 60's by different authors. Jerky {112} slip is combined with a more classical steady motion in planes close to {110}, but the proportion of steady motion decreases rapidly to zero at decreasing temperature, which leads to a gradual transition between the two mechanisms. These results account for the specific mechanical properties measured in case of a <110> straining axis. They also bring new elements to understand the discrepancy between theoretical and experimental stress values at low temperatures. Indeed, like in Fe, local stress values as a function of temperature and dislocation velocity do not obey to the classical rules of thermodynamics, in agreement with possible quantum effects." @default.
- W2891283378 created "2018-09-27" @default.
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- W2891283378 date "2018-12-01" @default.
- W2891283378 modified "2023-10-10" @default.
- W2891283378 title "Geometry and kinetics of glide of screw dislocations in tungsten between 95K and 573K" @default.
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- W2891283378 doi "https://doi.org/10.1016/j.actamat.2018.09.009" @default.
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