Abstract
Etude par microscopie electronique en transmission de la nucleation et de la croissance des precipites A13 dans l'alliage Fe-9Al-30Mn-3Cr apres vieillissement. Les precipites A13 sont observes apres vieillissement au-dessus de 525C. Ils germent de maniere heterogene, preferentiellement aux joints de grains ferrite/ferrite, aux dislocations et dans les regions contigues aux particules DO 3 . La croissance des precipites forment une microstructure de Widmanstatten en augmentant le temps de vieillissement
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