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Shrinkage of Pores Located at Grain Corners by Grain-Boundary Diffusion

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The densification rate of pores located at grain corners is obtained by constructing and analyzing a simple model with a transport mechanism of grain-boundary diffusion. The densification rate obtained for a microstructure of tetrakaidecahedral grains decreases with densification and is nearly consistent with the Wilkinson model at low porosities. The effect of grain-size distribution on the densification rate is also estimated under the two limiting conditions of constant stress and constant strain rate. At constant strain rate, the densification rate with grain-size distribution is lower than the value for the average grain size, whereas it is identical to the value at constant stress.

Document Type: Research Article


Affiliations: National Institute for Materials Science, Ibaraki 305 0047, Japan

Publication date: 2011-04-01

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