High-pressure high-temperature melting and recrystallization of nanolamellar high-entropy alloys

Chakrabarty, Kallol; Pope, Andrew D.; Yadav, Abhinav; Yang, Wuxian; Ren, Jie; Rangari, Vijaya; Chen, Wen; Vohra, Yogesh K.

doi:10.1016/j.jallcom.2025.179470

High-pressure high-temperature melting and recrystallization of nanolamellar high-entropy alloys

Journal Article · Wed Feb 26 00:00:00 EST 2025 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2025.179470· OSTI ID:2524587

^[1]; Pope, Andrew D. ^[2]; Yadav, Abhinav ^[3]; Yang, Wuxian ^[4]; Ren, Jie ^[4]; Rangari, Vijaya ^[3]; Chen, Wen ^[4]; Vohra, Yogesh K. ^[2]

University of Alabama at Birmingham, AL (United States); University of Alabama at Birmingham
University of Alabama at Birmingham, AL (United States)
Tuskegee University, AL (United States)
University of Massachusetts, Amherst, MA (United States)

Additively manufactured (AM) High Entropy Alloys (HEAs) are notable for their exceptional high-yield strength and large tensile ductility. The nanolamellar Eutectic HEA (EHEA) AlCoCrFeNi_2.1 was fabricated by laser powder bed fusion (L-PBF) in the as-printed form (EHEA1) and subsequently annealed at 1000oC (EHEA2) and 600oC (EHEA3) to achieve a broad range of mechanical properties. EHEA2 and EHEA3 samples were studied using Scanning transmission electron microscopy (STEM), energy dispersive X-ray diffraction (EDXRD) at high-pressures and high temperatures, nanoindentation hardness and modulus measurements. According to EDXRD EHEA2 and EHEA3 are composed of B2 and L1₂ phases. High-pressure high-temperature EDXRD studies show melting for EHEA2 at 1698 ± 25 K at a pressure of 6.5 GPa and melting for EHEA3 at 1598 ± 25 K at a pressure of 5.8 GPa. Post-melt and recrystallized samples were recovered at ambient conditions, and XRD analysis showed retention of B2 and L1₂ phases, although a new σ phase appeared for both EHEA2 and EHEA3 samples due to high-pressure and high-temperature melting and recrystallization experiment. SEM analysis also demonstrated the preservation of the nanolamellar morphology. Nanoindentation studies revealed that recrystallized EHEAs retain their original mechanical property hierarchy, with EHEA3 being 47% harder than EHEA2, largely related to higher content of B2-phase and retention of nanolamellar morphology. We also present Pressure-Volume-Temperature (P-V-T) data for 3-D printed and annealed eutectic high entropy alloys and extract mechanical and thermal properties data.

View Accepted Manuscript (DOE)

Research Organization:: University of Alabama at Birmingham, AL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: AC02-06CH11357; NA0004154

OSTI ID:: 2524587

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 1020; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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