Determination of solute site occupancies within γ' precipitates in nickel-base superalloys via orientation-specific atom probe tomography
Abstract
In this study, the analytical limitations in atom probe tomography such as resolving a desired set of atomic planes, for solving complex materials science problems, have been overcome by employing a well-developed unique and reproducible crystallographic technique, involving synergetic coupling of orientation microscopy with atom probe tomography. The crystallographic information in atom probe reconstructions has been utilized to determine the solute site occupancies in Ni-Al-Cr based superalloys accurately. The structural information in atom probe reveals that both Al and Cr occupy the same sub-lattice within the L12-ordered g precipitates to form Ni3(Al,Cr) precipitates in a Ni-14Al-7Cr(at.%) alloy. Interestingly, the addition of Co, which is a solid solution strengthener, to a Ni-14Al-7Cr alloy results in the partial reversal of Al site occupancy within g precipitates to form (Ni,Al)3(Al,Cr,Co) precipitates. This unique evidence of reversal of Al site occupancy, resulting from the introduction of other solutes within the ordered structures, gives insights into the relative energetics of different sub-lattice sites when occupied by different solutes.
- Authors:
-
- Univ. of North Texas, Denton, TX (United States)
- Air Force Research Lab., Dayton, OH (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1241481
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ultramicroscopy
- Additional Journal Information:
- Journal Volume: 159; Journal Issue: P2; Journal ID: ISSN 0304-3991
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; nickel-base superalloys; APT; EBSD; site occupancy; SDM
Citation Formats
Meher, Subhashish, Rojhirunsakool, Tanaporn, Nandwana, Peeyush, Tiley, Jamie, and Banerjee, Rajarshi. Determination of solute site occupancies within γ' precipitates in nickel-base superalloys via orientation-specific atom probe tomography. United States: N. p., 2015.
Web. doi:10.1016/j.ultramic.2015.04.015.
Meher, Subhashish, Rojhirunsakool, Tanaporn, Nandwana, Peeyush, Tiley, Jamie, & Banerjee, Rajarshi. Determination of solute site occupancies within γ' precipitates in nickel-base superalloys via orientation-specific atom probe tomography. United States. https://doi.org/10.1016/j.ultramic.2015.04.015
Meher, Subhashish, Rojhirunsakool, Tanaporn, Nandwana, Peeyush, Tiley, Jamie, and Banerjee, Rajarshi. Tue .
"Determination of solute site occupancies within γ' precipitates in nickel-base superalloys via orientation-specific atom probe tomography". United States. https://doi.org/10.1016/j.ultramic.2015.04.015. https://www.osti.gov/servlets/purl/1241481.
@article{osti_1241481,
title = {Determination of solute site occupancies within γ' precipitates in nickel-base superalloys via orientation-specific atom probe tomography},
author = {Meher, Subhashish and Rojhirunsakool, Tanaporn and Nandwana, Peeyush and Tiley, Jamie and Banerjee, Rajarshi},
abstractNote = {In this study, the analytical limitations in atom probe tomography such as resolving a desired set of atomic planes, for solving complex materials science problems, have been overcome by employing a well-developed unique and reproducible crystallographic technique, involving synergetic coupling of orientation microscopy with atom probe tomography. The crystallographic information in atom probe reconstructions has been utilized to determine the solute site occupancies in Ni-Al-Cr based superalloys accurately. The structural information in atom probe reveals that both Al and Cr occupy the same sub-lattice within the L12-ordered g precipitates to form Ni3(Al,Cr) precipitates in a Ni-14Al-7Cr(at.%) alloy. Interestingly, the addition of Co, which is a solid solution strengthener, to a Ni-14Al-7Cr alloy results in the partial reversal of Al site occupancy within g precipitates to form (Ni,Al)3(Al,Cr,Co) precipitates. This unique evidence of reversal of Al site occupancy, resulting from the introduction of other solutes within the ordered structures, gives insights into the relative energetics of different sub-lattice sites when occupied by different solutes.},
doi = {10.1016/j.ultramic.2015.04.015},
journal = {Ultramicroscopy},
number = P2,
volume = 159,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2015},
month = {Tue Apr 28 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Three-dimensional nanoscale characterisation of materials by atom probe tomography
journal, November 2016
- Devaraj, Arun; Perea, Daniel E.; Liu, Jia
- International Materials Reviews, Vol. 63, Issue 2