A Model for Boundary Diffusion Controlled Creep in Polycrystalline Materials

Journal of Applied Physics - Tập 34 Số 6 - Trang 1679-1682 - 1963
R. L. Coble1
1Ceramics Division, Department of Metallurgy, Massachusetts Institute of Technology, Cambridge 39, Massachusetts

Tóm tắt

The creep rate (ė) predicted by the boundary diffusion (Db) model is ė≃150σDbWΩ/(GS)3kT, where σ is the stress, W is the boundary width, (GS) is the average grain size, and Ω is vacancy volume. The stress dependence is the same as the lattice diffusion model, given by C. Herring, while the grain size dependence and the numerical constant are greater for boundary diffusion. Discussion of the mechanism of creep in polycrystalline alumina is based on the differences between the lattice and boundary diffusion models.

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Tài liệu tham khảo

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Thông tin xuất bản

Journal of Applied Physics

Tập 34 Số 6

1679-1682

Thông tin tác giả