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Numerical study on the effect of volume transformation strain on relaxation stress and corresponding hydrogen gap concentration in niobium matrix

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Document pages: 7 pages

Abstract: The effect of relaxation stress on hydrogen concentration in niobium (NB -) H medium was studied by iterative numerical simulation. In order to calculate the phase transformation strain, relaxation stress and corresponding relaxation hydrogen concentration around the dislocation, a new third-order polynomial formula is used in the model. With the help of this polynomial, the hydrogen induced relaxation stress never exceeds the dislocation stress, which indicates that the total stress field never changes to the compressed state and makes the results divergent. The current model calculates not only the hydrogen concentration near the dislocation, but also the hydrogen concentration far away from the dislocation. In addition, the effect of relaxation stress on the interaction energy is also captured model. Overall, the current findings shed light on the complicated hydrogen embrittlement mechanisms of metallic materials by demonstrating that hydrogen induced relaxation has a significant effect on the hydrogen atom concentration and the interaction energy between the existing internal stress field and the solute hydrogen atom.

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