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

Zhu, Lilong; Soto-Medina, Sujeily; Hennig, Richard G.; Manuel, Michele V.

doi:10.1016/j.jallcom.2019.152110

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

Journal Article · Wed Jan 01 00:00:00 EST 2020 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2019.152110· OSTI ID:1560879

Zhu, Lilong; Soto-Medina, Sujeily; Hennig, Richard G.;

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.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007742

OSTI ID:: 1560879

Alternate ID(s):: OSTI ID: 1593303; OSTI ID: 1593310

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 815 Journal Issue: C; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

Citation Metrics:

Cited by: 11 works

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36 MATERIALS SCIENCE
Al-Co-Fe system
Phase diagram
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Title: Experimental investigation of the Al–Co–Fe phase diagram over the whole composition range

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