Abstract

Etude par microscopie electronique conventionnelle et a haute resolution, par diffraction d'electrons des structures fines de l'austenite dans l'alliage Fe-28,9 Ni-5,7 Al (% poids) soumis a des traitements de vieillissement entre 673 et 923 K. Influence du traitement sur la temperature de debut de transformation martensitique. Les structures observees seraient dues a la formation de precipites coherents de structure ordonnee L1 0 . Etude de la relation entre les variations de la temperature de transformation et celle de la microstructure lors du vieillissement

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