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Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
6.9K
Phase decomposition and ordering in Ni-11.3 at.% Ti studied with atom probe tomography
T Al-Kassab1, M Kompatscher2, R Kirchheim3
1King Abdullah University of Science and Technology, Division of Physical Sciences, Thuwal, Saudi Arabia.
Micron (Oxford, England : 1993)
|July 2, 2014
Summary
Researchers reassessed Ni-rich Ni-Ti decomposition using advanced atom probe techniques. Findings suggest a three-phase model for better interpretation of small-angle neutron scattering data in Ni-Ti alloys.
Area of Science:
- Materials Science
- Metallurgy
- Nanotechnology
Background:
- Nickel-Titanium (Ni-Ti) alloys are crucial shape memory materials.
- Understanding Ni-rich Ni-Ti decomposition is key to optimizing alloy properties.
- Previous studies utilized small-angle neutron scattering (SANS) and a two-phase model.
Purpose of the Study:
- To reassess the decomposition behavior of Ni-rich Ni-Ti alloys.
- To investigate metastable precipitates using advanced atom probe methods.
- To refine the interpretation of SANS data for Ni-Ti decomposition.
Main Methods:
- Utilized Tomographic Atom Probe (TAP) and Laser Assisted Wide Angle Tomographic Atom Probe.
- Investigated single crystalline Ni-11.3 at.% Ti specimens.
- Analyzed metastable γ″ and γ' precipitate states.
Main Results:
- Atom probe data could not confirm precipitate composition values due to interface effects.
- Results indicate the necessity of a three-phase model for SANS data interpretation.
- The L12 structure and near 3:1 stoichiometry are maintained in precipitate cores across states.
Conclusions:
- The interface of ordered precipitates significantly impacts composition analysis.
- A three-phase model provides a more accurate interpretation of SANS data for Ni-rich Ni-Ti.
- The study refines the understanding of precipitate evolution during Ni-Ti decomposition.
