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Phase decomposition and ordering in Ni-11.3 at.% Ti studied with atom probe tomography
Institution:1. King Abdullah University of Science and Technology, Division of Physical Sciences, Thuwal, Saudi Arabia;2. Misapor AG, 7302 Landquart, Switzerland;3. Institut für Materialphysik, Georg-August Universität, 37077 Göttingen, Germany;4. Department of Physics, ETH Zurich, 8093 Zurich, Switzerland;5. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland;1. Dipartimento di Medicina Clinica e Sperimentale, Università degli studi di Foggia, Viale Pinto, 71122 Foggia, Italy;2. CNR-IPCF, Istituto per i Processi Chimico-Fisici, UOS di Bari, 70126 Bari, Italy;3. CSGI and Dipartimento di Chimica, Università di Bari, Via Orabona 4, 70126 Bari, Italy;4. Dipartimento di Scienze Mediche di Base, Neuroscienze ed Organi di Senso, Università degli Studi di Bari “Aldo Moro”, Policlinico-Piazza Giulio Cesare, 70124 Bari, Italy;1. Institute of Energy Conversion, University of Delaware, 451 Wyoming Rd, Newark, DE, 19716, USA;2. Department of Materials Science and Engineering, University of Delaware, 201 Dupont Hall, Newark, DE, 19716, USA;1. Department of Mechatronics Engineering, National Changhua University of Education, Changhua, Taiwan;2. Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan
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.
Keywords:Atom probe tomography  Phase transformation  Ni–Ti alloys  Precipitate-matrix interface
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