1816 量子分子動力学による応力起因拡散現象の基礎検討(J06-3 マイクロ・ナノ構造解析法と応用,J06 計算マイクロ・ナノメカニクス)

概要

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In order to make clear the mechanism of the texture change (rafting) of Ni-base superalloy under an uni-axial strain, molecular dynamics analysis was applied to analyze the effect of strain on the diffusion constant of element atoms around the interface between different materials. Since large strain more than a few percent exists at the interface due to mismatch in the lattice constant between the materials, the drastic change of the diffusion constant is expected to occur under high strain. Both the self-diffusion constants of Al and Ni increase drastically around the Al/Ni interface under tensile strain of 5%. The anisotropic diffusion was observed depending on the direction of the applied strain. The stress-induced diffusion occurs at the interface between different materials and it accelerates the diffusion constant of the component atom by about 10 times. This stress-induced diffusion may cause the texture change of the Ni-base superalloy.
2005-09-18