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Thermodynamics of Nano-Grain Boundaries

Published online by Cambridge University Press:  28 February 2011

Hans J. Fecht
Hans J. Fecht*
Affiliation:
Universität Augsburg, Institut für Physik, D-8900 Augsburg, F.R.G.
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Abstract

A universal, accurate and simple method is developed to describe the thermodynamic properties of disordered grain boundaries in nanocrystalline metals. Based on a free volume approach at negative pressure of the universal equation of state, the maximum free volume, bulk modulus, specific heat at constant pressure, thermal expansion coefficient, excess enthalpy, excess entropy and free energy of grain boundaries are derived from well-known thermodynamic relationships. Describing nanocrystalline metals as a bimodal material with a grain boundary component and a crystalline component, their thermodynamic properties can then be estimated by appropriate scaling of the boundary-to-volume ratio.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 206: Symposium G – Clusters and Cluster-Assembled Materials , 1990 , 587
Copyright
Copyright © Materials Research Society 1991

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References

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