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The effects of particle size distribution and induced unpinning during grain growth

Published online by Cambridge University Press:  31 January 2011

G. S. Thompson ,
J. M. Rickman ,
M. P. Harmer  and
E. A. Holm
G. S. Thompson
Affiliation:
Department of Materials Science and Engineering and the Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015–3195
J. M. Rickman
Affiliation:
Department of Materials Science and Engineering and the Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015–3195
M. P. Harmer
Affiliation:
Department of Materials Science and Engineering and the Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015–3195
E. A. Holm
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

The effect of a second-phase particle size distribution on grain boundary pinning was studied using a Monte Carlo simulation technique. Simulations were run using a constant number density of both whisker and rhombohedral particles, and the effect of size distribution was studied by varying the standard deviation of the distribution around a constant mean particle size. The results of present simulations indicate that, in accordance with the stereological assumption of the topological pinning model, changes in distribution width had no effect on the pinned grain size. The effect of induced unpinning of particles on microstructure was also studied. In contrast to predictions of the topological pinning model, a power law dependence of pinned grain size on particle size was observed at T = 0.0. Based on this, a systematic deviation to the stereological predictions of the topological pinning model is observed. The results of simulations at higher temperatures indicate an increasing power law dependence of pinned grain size on particle size, with the slopes of the power law dependencies fitting an Arrhenius relation. The effect of induced unpinning of particles was also studied in order to obtain a correlation between particle/boundary concentration and equilibrium grain size. The results of simulations containing a constant number density of monosized rhombohedral particles suggest a strong power law correlation between the two parameters.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 6 , June 1996 , pp. 1520 - 1527
Copyright
Copyright © Materials Research Society 1996

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References

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