Nanolamellar phase transition in an additively manufactured eutectic high-entropy alloy under high pressures

Pope, Andrew D.; Iwan, Seth; Clay, Matthew P.; Vohra, Yogesh K.; Katagiri, Kento; Dresselhaus-Marais, Leora; Ren, Jie; Chen, Wen

doi:10.1063/5.0138668

Nanolamellar phase transition in an additively manufactured eutectic high-entropy alloy under high pressures

Journal Article · Wed Mar 15 00:00:00 EDT 2023 · AIP Advances

DOI:https://doi.org/10.1063/5.0138668· OSTI ID:1961401

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Univ. of Alabama, Birmingham, AL (United States); University of Alabama at Birmingham
Univ. of Alabama, Birmingham, AL (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of Massachusetts, Amherst, MA (United States)

Much is unknown about how phase transitions link to micro-/nano-structures in high-entropy systems, especially under extreme pressure and temperature conditions. This work studies the evolution of dual-phase nanolamellar eutectic high-entropy alloy phases of AlCoCrFeNi_2.1 generated by laser powder-bed fusion (L-PBF) for pressures up to 42 GPa. We compare quasi-hydrostatic high pressure synchrotron x-ray diffraction studies on L-PBF printed cylindrical samples up to 5.5 GPa (large-volume Paris–Edinburgh cell) to those carried out on an L-PBF printed foil in a diamond anvil cell where the pressure reached 42 GPa. Our results show that the initially alternating face-centered cubic (FCC) and body-centered cubic (BCC) nanolamellar structure of AlCoCrFeNi_2.1 transformed into single-phase FCC nanolamellae under high pressure with BCC–FCC phase transformation completion at 21 ± 3 GPa. Our results indicate a diffusionless BCC–FCC transformation in this additively manufactured far-from-equilibrium microstructure and demonstrate that the FCC phase is stable up to very high pressures. The measured equation of state for the FCC phase of AlCoCrFeNi_2.1 is presented up to 42 GPa and shows excellent agreement between the data obtained in large-volume press and diamond anvil cell experiments.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Alabama, Birmingham, AL (United States)

Sponsoring Organization:: NASA/Alabama Space; USDOE; USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; NA0004090

OSTI ID:: 1961401

Alternate ID(s):: OSTI ID: 1961679

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 3 Vol. 13; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Nanolamellar phase transition in an additively manufactured eutectic high-entropy alloy under high pressures

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