Molecular Dynamics Study of Impurity Effects on Grain Boundary Grooving
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概要
- 論文の詳細を見る
Impurity effects on grain boundary grooving in crystalline aluminum are studied using computer molecular-dynamics simulation. We use a Morse potential that includes equilibrium spacing(r_<A1>)and potential well depth(|u_<A1>|)to characterize aluminum/aluminum interaction, and a two-body interatomic potential that includes equilibrium spacing(r_m)and potential well depth(|u_<min>|)to characterize aluminum/impurity interaction. Simulations show that when r_m is smaller than r_<A1> and when |u_<min>| is close to |u_<A1>|(within ±20% of it), grain boundary grooving is prevented. This effect is explained by a decrease in the ratio of grain boundary diffusion to surface diffusion. Diffusion coefficients obtained in our simulations show that impurities at grain boundaries which satisfy the above conditions(e.g. copper)strengthen surface diffusion without strengthening grain boundary diffusion.
- 社団法人日本機械学会の論文
- 1997-01-15
著者
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SASAKI Naoya
Mechanical Engineering Research Laboratory, Hitachi, Ltd.
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Iwasaki T
Hitachi Ltd. Ibaraki Jpn
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Iwasaki Tomio
Mechanical Engineering Res. Lab. Hitachi Ltd.
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YASUKAWA Akio
Mechanical Engineering Research Laboratory, Hitachi Ltd.
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CHIBA Norimasa
Mechanical Engineering Research Laboratory, Hitachi Ltd.
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Chiba Norimasa
Mechanical Engineering Research Laboratory Hitachi Ltd.
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Chiba Norimasa
Mechanical Engineering Lab. Hitachi Ltd.
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Sasaki N
Hitachi Ltd. Ibaraki Jpn
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Sasaki Naoya
Mechanical Engineering Research Laboratory Hitachi Ltd.
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Yasukawa Akio
Mechanical Engineering Research Laboratory Hitachi Ltd.
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Yasukawa Akio
Mechanical Engineering Research Laboratory Hitachi Ltd .
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IWASAKI Tomio
Mechanical Eng. Res. Laboratory, Hitachi, Ltd.
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