Phase stability of a eutectic high entropy alloy under extremes of pressures and temperatures
Abstract
Additively manufactured high-entropy alloys are of interest because of their unique combination of high yield strength and large ductility achieved with far-from-equilibrium crystalline phases and micro/nanostructure morphology. We report on the phase transformation and thermal equation of state of the eutectic high-entropy alloy (EHEA) Al18Co20Cr10Fe10Ni40W2, produced by laser powder-bed fusion (L-PBF). The EHEA was studied in a large-volume Paris–Edinburgh cell using energy-dispersive x-ray diffraction to a pressure of 5.5 GPa and a temperature of 1723 K. Static compression studies in diamond anvil cells using angle-dispersive x-ray diffraction extended the high-pressure structural data to 317 GPa at ambient temperature. The initial dual-phase nanolamellar face-centered cubic (FCC) and body-centered cubic (BCC) structure of Al18Co20Cr10Fe10Ni40W2 transforms into a single FCC phase under high pressure, with the BCC-to-FCC phase transformation completing at 9 ± 2 GPa. The FCC phase remained stable up to the highest pressure of 317 GPa. The measured thermal equation of state for the FCC phase of Al18Co20Cr10Fe10Ni40W2 is presented up to 5.5 GPa and 1473 K. We observed melting of the EHEA at 1698 ± 25 K at a pressure of 5.5 GPa, and the recrystallized sample shows an increased fraction of the CsCl-type (B2) phase at ambient conditions following release from the high-pressure high-temperature state. The BCC-to-FCC phasemore »
- Authors:
-
[1];
[1];
[1];
[2];
[2];
[2];
[1]
- Univ. of Alabama, Birmingham, AL (United States)
- Univ. of Massachusetts, Amherst, MA (United States)
- Publication Date:
- Research Org.:
- Univ. of Alabama, Birmingham, AL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 2309688
- Grant/Contract Number:
- NA0004154; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Advances
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 2; Journal ID: ISSN 2158-3226
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; extreme conditions; high-entropy alloys; additive manufacturing; phase transitions; thermal equation of state
Citation Formats
Pope, Andrew D., Iwan, Seth, Clay, Matthew P., Ren, Jie, Yang, Wuxian, Chen, Wen, and Vohra, Yogesh K. Phase stability of a eutectic high entropy alloy under extremes of pressures and temperatures. United States: N. p., 2024.
Web. doi:10.1063/5.0188644.
Pope, Andrew D., Iwan, Seth, Clay, Matthew P., Ren, Jie, Yang, Wuxian, Chen, Wen, & Vohra, Yogesh K. Phase stability of a eutectic high entropy alloy under extremes of pressures and temperatures. United States. https://doi.org/10.1063/5.0188644
Pope, Andrew D., Iwan, Seth, Clay, Matthew P., Ren, Jie, Yang, Wuxian, Chen, Wen, and Vohra, Yogesh K. Tue .
"Phase stability of a eutectic high entropy alloy under extremes of pressures and temperatures". United States. https://doi.org/10.1063/5.0188644. https://www.osti.gov/servlets/purl/2309688.
@article{osti_2309688,
title = {Phase stability of a eutectic high entropy alloy under extremes of pressures and temperatures},
author = {Pope, Andrew D. and Iwan, Seth and Clay, Matthew P. and Ren, Jie and Yang, Wuxian and Chen, Wen and Vohra, Yogesh K.},
abstractNote = {Additively manufactured high-entropy alloys are of interest because of their unique combination of high yield strength and large ductility achieved with far-from-equilibrium crystalline phases and micro/nanostructure morphology. We report on the phase transformation and thermal equation of state of the eutectic high-entropy alloy (EHEA) Al18Co20Cr10Fe10Ni40W2, produced by laser powder-bed fusion (L-PBF). The EHEA was studied in a large-volume Paris–Edinburgh cell using energy-dispersive x-ray diffraction to a pressure of 5.5 GPa and a temperature of 1723 K. Static compression studies in diamond anvil cells using angle-dispersive x-ray diffraction extended the high-pressure structural data to 317 GPa at ambient temperature. The initial dual-phase nanolamellar face-centered cubic (FCC) and body-centered cubic (BCC) structure of Al18Co20Cr10Fe10Ni40W2 transforms into a single FCC phase under high pressure, with the BCC-to-FCC phase transformation completing at 9 ± 2 GPa. The FCC phase remained stable up to the highest pressure of 317 GPa. The measured thermal equation of state for the FCC phase of Al18Co20Cr10Fe10Ni40W2 is presented up to 5.5 GPa and 1473 K. We observed melting of the EHEA at 1698 ± 25 K at a pressure of 5.5 GPa, and the recrystallized sample shows an increased fraction of the CsCl-type (B2) phase at ambient conditions following release from the high-pressure high-temperature state. The BCC-to-FCC phase transition completion pressure is correlated with the nanolamellae thickness of the BCC layer in this diffusion-less transformation at ambient temperature.},
doi = {10.1063/5.0188644},
journal = {AIP Advances},
number = 2,
volume = 14,
place = {United States},
year = {Tue Feb 20 00:00:00 EST 2024},
month = {Tue Feb 20 00:00:00 EST 2024}
}
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