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Shrinkage of Pores Located at Grain Corners by Grain‐Boundary Diffusion
Author(s) -
Kim ByungNam,
Hiraga Keijiro,
Morita Koji,
Yoshida Hidehiro,
Zhang Haibin
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04407.x
Subject(s) - materials science , grain boundary diffusion coefficient , grain size , strain rate , shrinkage , composite material , grain boundary , microstructure , grain boundary strengthening , diffusion , constant (computer programming) , stress (linguistics) , mineralogy , thermodynamics , geology , physics , linguistics , philosophy , computer science , programming language
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.