To cite this version:Borge Forbord, Williams Lefebvre, Frederic Danoix, Hakon Hallem, Knut Marthinsen. Three Dimensional Atom Probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys. Scripta Metallurgica, Elsevier, 2004, 51, pp.333-337. 10 Abstract. Three Dimensional Atom-Probe (3DAP) has been applied in order to study the nucleation of small, spherical and coherent Al 3 (Sc,Zr)-dispersoids. The results indicate that Al 3 (Sc,Zr) in the beginning of the nucleation process mainly consist of Al and Sc, while Zr enters the dispersoids at a later stage, i.e relatively Zr-rich shells seem to form around Sc-rich cores.

A new 3DAP reconstruction procedure is proposed, which accounts for the evaporation field of a secondary phase. It applies the existing cluster selection softwares to identify the atoms of the second phase and subsequently an iterative algorithm to homogenise the volume laterally. This procedure, easily implementable on existing reconstruction software, has been applied successfully on simulated and real 3DAP analyses.

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