Behavior of Super-saturated Vacancies during the Initial Stage of Creep

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  • クリープ初期における過飽和空孔の挙動について
  • クリープ ショキ ニ オケル カホウワ クウコウ ノ キョドウ ニ ツイテ

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From the analysis of the data obtained by creep tests of OFHC copper it is suggested that the initial part of the creep curve at high temperature corresponds to a rate process where the diffusion of super-saturated vacancies is the rate-determining process.Assuming that the extinction of one vacancy by diffusion contributes a unit amount of strain, which induces the climbing motion of a dislocation and the progress of the polygonization, and that the decrement of the vacancies is proportional to the number of the vacancies existing at that moment, it is shown that the proportional constant obeys the equation of the rate process, and that the activation energy of this constant is 23 kcal/mol, which is about the half value of the activation energy of self-diffusion of copper.

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