ORDERING IN METALLIC ALLOYS BY FIM-ATOM PROBE TECHNIQUES

Abstract
The ordering of Ni-12 at% Ti and AlNiCo 5 has been investigated using Field Ion Microscopy (FIM) and Atom Probe (AP) techniques. Ni-12 at% Ti orders at 550 °C during the spinodal decomposition resulting in a L12-structure for the Ti enriched areas. The homogenized state of AlNiCo 5 shows a state of order between Al and Ni before spinodal decomposition sets in at lower aging temperatures. The results are compared with those of a stoichiometric Ni3Al specimen which was used as an ordered "model alloy"

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