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http://hdl.handle.net/20.500.12358/24720
TitleNumerical simulations of coarsening of eutectoid structures: Implications for grain size in the lower mantle
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Abstract

Since it has been realized that the viscosity of the lower mantle depends on the grain size, several studies have been conducted to constrain grain size in the lower mantle. One of the problems is that the initial structure generated by spinel-perovskite phase transformation is characterized by lamellae of alternating perovskite and magnesioüstite. It is not clear how long it takes for such structures to reach the asymptotic regime of conventional Ostwald ripening and whether this can happen on typical time scales of laboratory experiments. We performed numerical simulations of coarsening of lamellar structures using Monte Carlo Potts model. We find that at high temperatures, an isotropic lamellar structure degenerates into nearly equiaxed grains with the diameter which is 2 to 3 times larger that the original lamellar spacing. The duration of this process is comparable with that expected for conventional Ostwald …

Authors
El-Khozondar, Rifa J.
Solomatov, VS
Solomatov, Vitcheslav S
Tikare, V
Tikare, Veena
TypeJournal Article
Date2001
Published inAGU Fall Meeting Abstracts
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The institutional repository of the Islamic University of Gaza was established as part of the ROMOR project that has been co-funded with support from the European Commission under the ERASMUS + European programme. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

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The institutional repository of the Islamic University of Gaza was established as part of the ROMOR project that has been co-funded with support from the European Commission under the ERASMUS + European programme. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

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