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Title: Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range

Abstract

Knowledge of the phase stability in the Al-Co-Fe ternary system is critical for developing Al-Fe-Si-based low-cost lightweight high-temperature materials and is thus experimentally investigated over the whole composition range. Three complete isothermal sections at 1000, 900 and 800 °C were constructed based on the results measured from three identical Co/Fe/Al5Fe2 diffusion triples and forty-three equilibrated alloys using data from scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD). At all the three temperatures, a continuous solution, Al13(Co,Fe)4, was confirmed between the Al13Fe4 and M-Al13Co4 phases. Phase boundaries of the γ, α, β, Al2Fe, Al5Fe2, Al5Co2, Al9Co2 and Al13(Co,Fe)4 phases and the corresponding phase equilibrium relations were clearly defined from the obtained tie-lines and phase boundary data. Three three-phase regions were confirmed in the 1000 °C isothermal section, while four three-phase regions were confirmed in the 900 and 800 °C isothermal sections. The large amount of new phase equilibrium data proposed in this work will serve as reliable input for future thermodynamic assessments of the Al-Co-Fe system within the CALPHAD (CALculation of PHAse Diagrams) framework to improve the current Al thermodynamic databases.

Authors:
; ; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1560879
Alternate Identifier(s):
OSTI ID: 1593303; OSTI ID: 1593310
Grant/Contract Number:  
EE0007742
Resource Type:
Published Article
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Name: Journal of Alloys and Compounds Journal Volume: 815 Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
36 MATERIALS SCIENCE; Al-Co-Fe system; Phase diagram; Diffusion triple; Equilibrated alloy; CALPHAD

Citation Formats

Zhu, Lilong, Soto-Medina, Sujeily, Hennig, Richard G., and Manuel, Michele V. Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range. Netherlands: N. p., 2020. Web. doi:10.1016/j.jallcom.2019.152110.
Zhu, Lilong, Soto-Medina, Sujeily, Hennig, Richard G., & Manuel, Michele V. Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range. Netherlands. https://doi.org/10.1016/j.jallcom.2019.152110
Zhu, Lilong, Soto-Medina, Sujeily, Hennig, Richard G., and Manuel, Michele V. Wed . "Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range". Netherlands. https://doi.org/10.1016/j.jallcom.2019.152110.
@article{osti_1560879,
title = {Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range},
author = {Zhu, Lilong and Soto-Medina, Sujeily and Hennig, Richard G. and Manuel, Michele V.},
abstractNote = {Knowledge of the phase stability in the Al-Co-Fe ternary system is critical for developing Al-Fe-Si-based low-cost lightweight high-temperature materials and is thus experimentally investigated over the whole composition range. Three complete isothermal sections at 1000, 900 and 800 °C were constructed based on the results measured from three identical Co/Fe/Al5Fe2 diffusion triples and forty-three equilibrated alloys using data from scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD). At all the three temperatures, a continuous solution, Al13(Co,Fe)4, was confirmed between the Al13Fe4 and M-Al13Co4 phases. Phase boundaries of the γ, α, β, Al2Fe, Al5Fe2, Al5Co2, Al9Co2 and Al13(Co,Fe)4 phases and the corresponding phase equilibrium relations were clearly defined from the obtained tie-lines and phase boundary data. Three three-phase regions were confirmed in the 1000 °C isothermal section, while four three-phase regions were confirmed in the 900 and 800 °C isothermal sections. The large amount of new phase equilibrium data proposed in this work will serve as reliable input for future thermodynamic assessments of the Al-Co-Fe system within the CALPHAD (CALculation of PHAse Diagrams) framework to improve the current Al thermodynamic databases.},
doi = {10.1016/j.jallcom.2019.152110},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 815,
place = {Netherlands},
year = {Wed Jan 01 00:00:00 EST 2020},
month = {Wed Jan 01 00:00:00 EST 2020}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.jallcom.2019.152110

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Cited by: 11 works
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