Atomic-scale study of transformation paths in unmixing and ordering reactions
Résumé
The Tomographic Atom-Probe (TAP) is a new high resolution nanoanalytical microscope, which provides three-dimensional maps of chemical heterogeneities in a metallic material on a near-atomic scale. Application of the TAP to unmixing and ordering in metallic alloys is discussed and illustrated through various examples (spinodal decomposition in FeCr ferritic phases, nucleation and growth of LI2 ordered precipitates in nickel based alloys, precipitation in maraging steels). The role of the TAP in the investigation of transformation paths in these systems is discussed.