Analysis of the plasticizing effect of hydrogen dissolved in a crystal on the evolution of plastic deformation at the tip of a crack |
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Authors: | D. N. Karpinskii S. V. Sannikov |
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Affiliation: | (1) Research Institute of Mechanics and Applied Mathematics, Rostov State University, Rostov-on-Don, 344090, Russia |
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Abstract: | The effect of interstitial hydrogen atoms on the evolution of plastic deformation in a crystal at the tip of a tensile crack is estimated taking into account gas exchange at the crack banks. It is found that, for an initial concentration of not less than 10?4, the plasticizing effect of dissolved hydrogen causing a dislocation expulsion is significant and can be responsible (at least, partially) for plasticization. As regards the evolution of the distribution of hydrogen atoms, a monotonic drain of dissolved hydrogen atoms into the hollow of the crack is observed for concentrations below 5×10?4, while at higher concentrations the impurity concentration at the banks of the crack varies periodically: complete drain is replaced by the accumulation of hydrogen corresponding to a “blocking” of the drain by the gas pressure. Numerical calculations are made for an α-Fe crystal. |
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