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Influence of trap connectivity on H diffusion: Vacancy trapping

Wang, Yu and Connétable, Damien and Tanguy, Döme Influence of trap connectivity on H diffusion: Vacancy trapping. (2016) Acta Materialia, 103. 334-340. ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2015.10.018

Abstract

A model is given for the effective diffusion of interstitial solutes in the presence of traps. It goes beyond Oriani's by taking into account, in a simple way, the connectivity between interstitial trap sites. It shows, in particular, that the typical dimension of a network of trap sites, connected by low barriers, appears squared in the diffusion coefficient. Therefore, a large precipitate can be inefficient if it offers a fast diffusion path, even if each individual trap site is deep. The model is illustrated in the case of hydrogen trapping at vacancies in Ni, using ab initio calculations for migration barriers and Kinetic Monte Carlo for validation. Trapping/detrapping kinetic parameters for “Thermal Desorption Spectra” analysis are also given.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found a http://www.sciencedirect.com/science/article/pii/S1359645415300185?via%3Dihub
HAL Id:hal-01564913
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:19 Jul 2017 09:32

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