title: Probing the crystallography of ordered Phases by coupling of orientation microscopy with atom probe tomography.
abstract: The determination of atomic scale structural and compositional information using atom probe tomography is currently limited to elemental solids and dilute alloys. In the present article, a unique coupling of orientation microscopy and atom probe tomography successfully facilitates the crystallographic study of non-dilute alloy systems, with high evaporation fields. This reproducible methodology affords a new perspective to the conventional atom probe tomography of ordered precipitate strengthened superalloys. The high accuracy in crystallographic site-specific sample preparation results in high spatial resolution in APT, which has been demonstrated in Co-base superalloys. The practical applications of this technique can be extended to accurately characterize the nature of buried order/disorder interfaces at the atomic scale, as well as the site occupancies associated with different solute atoms in multi-component superalloys.
authors.affiliation: Center for Advanced Research and Technology and Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA.
authors.forename: S
authors.initials: S
authors.lastname: Meher
authors.affiliation: Center for Advanced Research and Technology and Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA.
authors.forename: P
authors.initials: P
authors.lastname: Nandwana
authors.affiliation: Center for Advanced Research and Technology and Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA.
authors.forename: T
authors.initials: T
authors.lastname: Rojhirunsakool
authors.affiliation: Materials and Manufacturing Directorate, Air Force Research Laboratory, Dayton, OH, USA.
authors.forename: J
authors.initials: J
authors.lastname: Tiley
authors.affiliation: Center for Advanced Research and Technology and Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA. Electronic address: rajarshi.banerjee@unt.edu.
authors.forename: R
authors.initials: R
authors.lastname: Banerjee
keywords: APT; EBSD; Field evaporation; Ordered phases; SDM; Superalloys