粒成長過程における低易動度粒界の挙動のモンテカルロシミュレーション

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タイトル別名
  • Monte Carlo Simulation for the Behavior of Low Mobility Grain Boundaries in Grain Growth
  • リュウ セイチョウ カテイ ニ オケル テイ イドウド リュウカイ ノ キョド

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The change in frequency of grain boundaries with low mobility was investigated during grain growth using the Monte Carlo simulation. 4900 cells were generated and each grain was consisted of several cells in the initial condition. Each grain was randomly given a real number which corresponds to a grain orientation. Two types of grain boundaries classified for a mobility were characterized by the difference of each grain’s number. The mobility ratios were 1:1, 1:2, 1:10 or 1:100 and the fractions of grain boundary with low mobility in the initial state were 8, 32 and 73%.<BR>Grain boundaries with lower mobility tended to increase their existence ratio during grain growth, and this tendency became more noticeable with increasing mobility ratio. The frequency of grain boundary with lower mobility increased from 32% at the initial state to 55% as the grain size increased by four times. The drastic change of the fraction was observed when the grain size became large enough compared to the specimen area.<BR>From the initial state of 73%, the frequecy of grain boundary with lower mobility increased up to 83%. However, little change of the frequency was observed in the case with the initial state of 8%. Meanwhile, there existed some areas of localized grain boundaries with lower mobility and the change of microstructure in these areas was less than those of the other areas.<BR>Thus, the controlling factors for changing the fraction of the grain boundaries with lower mobility are; (1) the initial fraction of grain boundaries with lower motility, (2) ratios of the mobilities and (3) the dirstribution of the boundaries with lower mobility.

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