VAN LANDEGHEM, Hugo; DANOIX, Raphaële; GOUNÉ, Mohamed; BOURDINEAUD-BORDÈRE, Sylvie; MARTINAVIČIUS, Andrius; JESSNER, Peter; EPICIER, Thierry; HANNOYER, Béatrice; DANOIX, Frédéric; REDJAÏMIA, Abdelkrim

doi:10.3390/ma11081409

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VAN LANDEGHEM, Hugo
Institut Jean Lamour [IJL]
Labex DAMAS
Science et Ingénierie des Matériaux et Procédés [SIMaP ]

DANOIX, Raphaële
Groupe de physique des matériaux [GPM]

GOUNÉ, Mohamed
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Materials. 2018-08-11, vol. 11, n° 8, p. 1409

MDPI

Résumé en anglais

Atom Probe Tomography (APT), Transmission Electron Microscopy (TEM), and 3D mechanical calculations in complex geometry and anisotropic strain fields were employed to study the role of minor elements in the precipitation process of silicon and chromium nitrides in nitrided Fe–Si and Fe–Cr alloys, respectively. In nitrided Fe–Si alloys, an original sequence of Si3N4 precipitation was highlighted. Al–N clusters form first and act as nucleation sites for amorphous Si3N4 nitrides. This novel example of particle-simulated nucleation opens a new way to control Si3N4 precipitation in Fe–Si alloys. In nitrided Fe–Cr alloys, both the presence of iron in chromium nitrides and excess nitrogen in the ferritic matrix are unquestionably proved. Only a certain part of the so-called excess nitrogen is shown to be explained by the elastic accommodation of the misfit between nitride and the ferritic matrix. The presence of immobile excess nitrogen trapped at interfaces can be highly suspected.< Réduire

Mots clés en anglais

excess nitrogen

clusters precipitation

Fe–Si and Fe–Cr nitrided alloys

APT and TEM characterization

DOI

http://dx.doi.org/10.3390/ma11081409

Project ANR

Design des Alliages Métalliques pour Allègement des Structures - ANR-11-LABX-0008

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026