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Analysis of Creep Deformation Due to Grain-Boundary Diffusion/Sliding

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Abstract:

For steady-state deformation caused by grain-boundary diffusion and viscous grain-boundary sliding, the creep rate of regular polyhedral grains is analyzed by the energy-balance method. For the microstructure, the grain-grain interaction increases the degree of symmetry of diffusional field, resulting in a decrease of the effective diffusion distance. Meanwhile, the viscous grain-boundary sliding is found to decrease the creep rate. The present analysis reveals that the grain-size exponent is dependent on the grain size and the grain-boundary viscosity: the exponent becomes unity for small grain sizes and/or high viscosity, while it is three for large grain sizes and/or low viscosity.

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Periodical:

Key Engineering Materials (Volumes 345-346)

Pages:

565-568

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.565

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Online since:

August 2007

Authors:

Byung Nam Kim, Keijiro Hiraga, Koji Morita, Hidehiro Yoshida

Keywords:

Creep, Grain Boundary Diffusion, Grain Boundary Sliding (GBS), Grain Size

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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