Numéro
J. Phys. Colloques
Volume 49, Numéro C6, Novembre 1988
35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
Page(s) C6-365 - C6-371
DOI https://doi.org/10.1051/jphyscol:1988663
35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ

J. Phys. Colloques 49 (1988) C6-365-C6-371

DOI: 10.1051/jphyscol:1988663

ANALYSIS OF THE DO3 SUPERLATTICE IN ORDERED IRON ALUMINIUM ALLOYS BY FIM AND ATOM PROBE

H.-J. KRAUSE-HABROCK1, G. FROMMEYER1, J.E. WITTIG2 et M. KREUSS1

1  Max-Planck-Institut für Eisenforschung, Max-Planck-Strasse 1, D-4000 Düsseldorf, F.R.G.
2  Vanderbilt University, PO Box 6309, Station B, Nashville, TN 37235, U.S.A.


Abstract
The perfection of the ordered DO3 structure in Fe-(20/26/30 at%) Al alloys has been studied using field ion microscopy (FIM), atom probe (AP) measurements, and transmission electron microscopy (TEM) dark field (DF) imaging. FIM images provide a means to qualitatively characterize the degree of order in these materials. However, AP surveys of [111] poles supply additional information concerning the local perfection of the DO3 superlattice. Although the microstructure can appear completely ordered in both FIM and TEM-DF images, the AP investigations have revealed that perfect DO3 order occurs in only limited regions (10 to 20 unit cells) while many imperfections are always present in the atomic arrangements of the DO3 structure.