Rare-earth high entropy alloys with hexagonal close-packed structure

Qiao, Jun Wei; Bao, M. L.; Zhao, Y. J.; Yang, H. J.; Wu, Y. C.; Zhang, Y.; Hawk, J. A.; Gao, Michael C.

doi:10.1063/1.5051514

Title: Rare-earth high entropy alloys with hexagonal close-packed structure

Journal Article · 14 November 2018 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5051514 · OSTI ID:1509712

Qiao, Jun Wei ^[1]; Bao, M. L. ^[1]; Zhao, Y. J. ^[1]; Yang, H. J. ^[1]; Wu, Y. C. ^[1];

^[2]; Hawk, J. A. ^[3]; Gao, Michael C. ^[4]

Taiyuan Univ. of Technology, Taiyuan (China)
Univ. of Science and Technology Beijing, Beijing (China)
National Energy Technology Lab. (NETL), Albany, OR (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, South Park, PA (United States)

The formation of octonary DyErGdHoLuScTbY and senary DyGdHoLaTbY and ErGdHoLaTbY high-entropy alloys (HEAs) with the hexagonal close-packed (HCP) structure was reported in this study. Experiments using scanning electron microscopy and x-ray diffraction confirmed the single HCP solid solution in the as-cast state for these three HEAs if the presence of minor rare-earth oxides due to contamination from processing is ignored. The measured compressive yield stress values for these HEAs at room temperature are 245, 205, and 360 MPa for the ErGdHoLaTbY, DyGdHoLaTbY, and DyErGdHoLuScTbY HEAs, respectively. As a result, the corresponding solid solution strengthening contributions for these HEAs were estimated using a simple elastic model, and the resulting contributions were 28 MPa, 27 MPa, and 42 MPa for the three aforementioned HEAs.

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Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: FE; USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1509712

Report Number(s):: NETL-PUB-22339

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 19 Vol. 124; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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