The thermodynamics of hydride precipitation:The importance of entropy, enthalpy and disorder

Lumley, S. C. and Grimes, R. W. and Murphy, S. T. and Burr, P. A. and Chroneos, A. and Chard-Tuckey, P. R. and Wenman, M. R. (2014) The thermodynamics of hydride precipitation:The importance of entropy, enthalpy and disorder. Acta Materialia, 79. pp. 351-362. ISSN 1359-6454

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The precipitation of zirconium hydrides from Zr solid solution was investigated using first-principles lattice dynamics simulations. These included the temperature-dependent vibrational enthalpy and vibrational entropy combined with the configurational entropy terms. In contrast with previous approaches, it was found that the latent enthalpy alone is not sufficient to fully describe precipitation of hydrides; a full thermodynamic assessment is required. In particular, the vibrational enthalpy of precipitation assists in stabilizing hexagonal close-packed hydrides and is especially important in forming the metastable zeta phase. The configurational entropy change during precipitation favours face-centred cubic hydrides. Given this, at concentrations below 300 ppm H, no hydride precipitation is predicted, suggesting that when hydrides are seen in those materials it is because the local concentration of H is greater than that measured globally. While gamma hydride is the most stable phase, it is very close in energy to the delta phase. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Acta Materialia
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24 May 2018 12:20
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22 Nov 2022 05:56