title: Atom probe study of B2 order and A2 disorder of the FeCo matrix in an Fe-Co-Mo-alloy.
abstract: The physical and mechanical properties of intermetallic alloys can be tailored by controlling the degree of order of the solid solution by means of heat treatments. FeCo alloys with an appropriate composition exhibit an A2-disorder↔B2-order transition during continuous cooling from the disordered bcc region. The study of atomic order in intermetallic alloys by diffraction and its influence on the material properties is well established, however, investigating magnetic FeCo-based alloys by conventional methods such as X-ray diffraction is quite challenging. Thus, the imaging of ordered FeCo-nanostructures needs to be done with high resolution techniques. Transmission electron microscopy investigations of ordered FeCo domains are difficult, due to the chemical and physical similarity of Fe and Co atoms and the ferromagnetism of the samples. In this work it will be demonstrated, that the local atomic arrangement of ordered and disordered regions in an industrial Fe-Co-Mo alloy can be successfully imaged by atom probe measurements supported by field ion microscopy and transmission Kikuchi diffraction. Furthermore, a thorough atom probe parameter study will be presented and field evaporation artefacts as a function of crystallographic orientation in Fe-Co-samples will be discussed.
authors.affiliation: Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef Straße 18, 8700 Leoben, Austria; Böhler Edelstahl GmbH & Co KG, Mariazellerstraße 25, 8605 Kapfenberg, Austria. Electronic address: christoph.turk@bohler-edelstahl.at.
authors.forename: C
authors.initials: C
authors.lastname: Turk
authors.affiliation: Böhler Edelstahl GmbH & Co KG, Mariazellerstraße 25, 8605 Kapfenberg, Austria.
authors.forename: H
authors.initials: H
authors.lastname: Leitner
authors.affiliation: Böhler Edelstahl GmbH & Co KG, Mariazellerstraße 25, 8605 Kapfenberg, Austria.
authors.forename: I
authors.initials: I
authors.lastname: Schemmel
authors.affiliation: Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef Straße 18, 8700 Leoben, Austria.
authors.forename: H
authors.initials: H
authors.lastname: Clemens
authors.affiliation: Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef Straße 18, 8700 Leoben, Austria; School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
authors.forename: S
authors.initials: S
authors.lastname: Primig
keywords: Atom probe tomography; Ordering behavior; Parameter study; Transmission Kikuchi diffraction