title: Phase decomposition and ordering in Ni-11.3 at.% Ti studied with atom probe tomography.
abstract: The decomposition behavior of Ni-rich Ni-Ti was reassessed using Tomographic Atom Probe (TAP) and Laser Assisted Wide Angle Tomographic Atom Probe. Single crystalline specimens of Ni-11.3 at.% Ti were investigated, the states selected from the decomposition path were the metastable γ″ and γ' states introduced on the basis of small-angle neutron scattering (SANS) and the two-phase model for evaluation. The composition values of the precipitates in these states could not be confirmed by APT data as the interface of the ordered precipitates may not be neglected. The present results rather suggest to apply a three-phase model for the interpretation of SANS measurements, in which the width of the interface remains nearly unchanged and the L12 structure close to 3:1 stoichiometry is maintained in the core of the precipitates from the γ″ to the γ' state.
authors: King Abdullah University of Science and Technology, Division of Physical Sciences, Thuwal, Saudi Arabia.
authors: T
authors: T
authors: Al-Kassab
authors: Misapor AG, 7302 Landquart, Switzerland.
authors: M
authors: M
authors: Kompatscher
authors: Institut für Materialphysik, Georg-August Universität, 37077 Göttingen, Germany.
authors: R
authors: R
authors: Kirchheim
authors: Department of Physics, ETH Zurich, 8093 Zurich, Switzerland.
authors: G
authors: G
authors: Kostorz
authors: Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland. Electronic address: bernd.schoenfeld@mat.ethz.ch.
authors: B
authors: B
authors: Schönfeld
keywords: Atom probe tomography; Ni–Ti alloys; Phase transformation; Precipitate-matrix interface