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Article Dans Une Revue Acta Materialia Année : 2010

Phase transformations in nickel sulphide: Microstructures and mechanisms

Résumé

Nickel sulphide inclusions are known to be responsible for delayed fracture in tempered glasses due to phase transformation within the inclusion. Microstructural identification of the phase transformation mechanisms in the Ni-S system close to the NiS composition were carried out on a series of partially transformed states. Observations allow to investigate the morphological evolution during transformation, the phase orientation relationships and the first stages of the transformation were investigated by optical microscopy, electron backscatter diffraction, and scanning and transmission electron microscopy. The transformation mechanisms change significantly with the change in sulphur content of the alpha-NiS phase. Massive transformation is observed for near-stoichiometric composition. For over-stoichiometric composition, the transformation is controlled by a long-range diffusion mechanism. The influence of stoichiometry and impurities (Fe) on the microstructural evolution and transformation mechanisms has also been studied.

Dates et versions

hal-00528000 , version 1 (20-10-2010)

Identifiants

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O. Yousfi, P. Donnadieu, Y. Brechet, F. Robaut, F. Charlot, et al.. Phase transformations in nickel sulphide: Microstructures and mechanisms. Acta Materialia, 2010, 58 (9), pp.3367-3380. ⟨10.1016/j.actamat.2010.02.011⟩. ⟨hal-00528000⟩
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