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Article Dans Une Revue Materials Chemistry and Physics Année : 2022

Ta2C precipitation after low pressure carburizing of tantalum

Résumé

Low pressure carburizing cycles were carried out on tantalum samples. A Ta2C precipitates layer is present under the TaC and Ta2C surface layers. As the TaC and Ta2C layers, the Ta2C precipitates layer (TPL) grows by carbon diffusion in tantalum matrix. Specific zones with low precipitates content were observed at the bulk surface and in the tantalum grain boundaries. Other zones with lower precipitates content are also present in carburized and annealed samples. All the zones with low precipitates content are induced by the Ta2C precipitation mechanism described by Dahmen et al. [1,2]. Indeed, Ta2C needs vacancies to precipitate. If vacancy sinks are present at the bulk surface, at a grain boundary or in a dislocation, then Ta2C precipitation is highly reduced. Another effect of the annealing treatment is an increase of the Ta2C precipitates layers growth rate.

Domaines

Matériaux
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Dates et versions

hal-04273082 , version 1 (07-11-2023)

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Dominique Cotton, Philippe Jacquet, Sébastien Faure, Vincent Vignal. Ta2C precipitation after low pressure carburizing of tantalum. Materials Chemistry and Physics, 2022, 278, pp.125632. ⟨10.1016/j.matchemphys.2021.125632⟩. ⟨hal-04273082⟩
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