Hydrogen Permeation Behavior in Dual Phase Metals by Computer Simulation

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  • 計算機シミュレーションによる2相金属材料中の水素透過挙動
  • ケイサンキ シミュレーション ニヨル 2ソウ キンゾク ザイリョウ チュウ ノ

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Abstract

A hydrogen permeation test in dual phase metals composed by α and γ phases was simulated for some models using Crank-Nicolson method. Diffusion constants of hydrogen in α and γ phase were assumed to be 1.5×10-11 and 3.8×10-15 m2s-1 respectively ; the ratio of hydrogen solubility of γ to α phase was assumed to be 8.8. According to the result of numerical simulation, hydrogen diffuses at first in the α phase, of which diffusion constant is large, around γ phase, of which diffusion constant is much small, the starts diffusing into the γ phase from every direction. Thus, γ phase delays hydrogen permeation and decreases amount of hydrogen permeation. This effect becomes large with aspect ratio of γ phase.

Journal

  • Materials System

    Materials System 16 (0), 115-119, 1997

    Materials System Research Laboratory, Kanazawa Institute of Technology

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