Creep and fatigue damages of Ni-base- superalloy caused by strain-induced anisotropic diffusion of component elements

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外文摘要：The mechanism of the directional coarsening of γ' phases (rafting) of Ni-base superalloy under an uni-axial strain was analyzed by molecular dynamics (MD) analysis. The stress-induced anisotropic diffusion of Al atoms perpendicular to the interface was observed clearly in a Ni(001)/Ni_3Al(001) interface structure, The reduction of the diffusion of Al atoms perpendicular to the interface is thus, effective for improving the creep and fatigue resistance of the alloy. It was also found that the dopant elements in the superalloy also affected the strain-induced diffusion of Al atoms. Pd was one of the most effective elements which restrain Al atoms from moving around the interface.

外文关键词：

molecular dynamicscreepfatiguestress-induced diffusionni-base superalloy

作者：

Hideo Miura、Ken Suzuki、Hiroyuki Ito、Tatsuya Inoue

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作者单位：

Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University,6-6-11-712 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan

Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University,6-6-11-716 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan

Department of Nanomechanics, Graduate School of Engineering, Tohoku University, 6-6-11-716 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan

出版年：

2010

Key engineering materials

ISSN：1013-9826

年,卷(期)：2010.417/418