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


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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.



Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim




B. N. Kim et al., "Analysis of Creep Deformation Due to Grain-Boundary Diffusion/Sliding", Key Engineering Materials, Vols. 345-346, pp. 565-568, 2007

Online since:

August 2007




[1] R.L. Coble: J. Appl. Phys. Vol. 34 (1963), p.1679.

[2] H.W. Green: J. Appl. Phys. Vol. 41 (1970), p.3899.

[3] M.F. Ashby and R.A. Verrall: Acta Metall. Vol. 21 (1973), p.149.

[4] J.R. Spingarn and W.D. Nix: Acta Metall. Vol. 26 (1978), p.1389.

[5] B. -N. Kim, K. Hiraga, K. Morita and B. -W. Ahn: Phil. Mag. Vol. 84 (2004), p.3251.

[6] J. Pan and A.C.F. Cocks: Comput. Mater. Sci. Vol. 1 (1993), p.95.

[7] P.M. Hazzledine and J.H. Schneibel: Acta Metall. Mater. Vol. 41 (1993), p.1253.

[8] B. -N. Kim and K. Hiraga: Acta Mater. Vol. 48 (2000), p.4151.

[9] S. Onaka, A. Madgwick and T. Mori: Acta Mater. Vol. 49 (2001), p.2161.

[10] T. Mori, Y. Nakasone, M. Taya and K. Wakashima: Phil. Mag. Lett. Vol. 75 (1997), p.359.

[11] B. -N. Kim, K. Hiraga and K. Morita: Acta Mater. Vol. 53 (2005), p.1791.

[12] R.N. Stevens: Phil. Mag. Vol. 23 (1971), p.65.

[13] K. Morita and K. Hiraga: Phil. Mag. Lett. Vol. 83 (2003), p.97.