Design of refractory high-entropy alloys

Gao, M. C.; Carney, C. S.; Dogan, O. N.; Jablonksi, P. D.; Hawk, J. A.; Alman, D. E.

doi:10.1007/s11837-015-1617-z

Title: Design of refractory high-entropy alloys

Journal Article · Tue Sep 15 00:00:00 EDT 2015 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-015-1617-z· OSTI ID:1258464

Gao, M. C. ^[1]; Carney, C. S. ^[1]; Dogan, O. N. ^[2]; Jablonksi, P. D. ^[2]; Hawk, J. A. ^[2]; Alman, D. E. ^[2]

National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)

Here, this report presents a design methodology for refractory high-entropy alloys with a body-centered cubic (bcc) structure using select empirical parameters (i.e., enthalpy of mixing, atomic size difference, Ω-parameter, and electronegativity difference) and CALPHAD approach. Sixteen alloys in equimolar compositions ranging from quinary to ennead systems were designed with experimental verification studies performed on two alloys using x-ray diffraction, energy-dispersive spectroscopy, and scanning electron microscopy. Two bcc phases were identified in the as-cast HfMoNbTaTiVZr, whereas multiple phases formed in the as-cast HfMoNbTaTiVWZr. Observed elemental segregation in the alloys qualitatively agrees with CALPHAD prediction. Comparisons of the thermodynamic mixing properties for liquid and bcc phases using the Miedema model and CALPHAD are presented. This study demonstrates that CALPHAD is more effective in predicting HEA formation than empirical parameters, and new single bcc HEAs are suggested: HfMoNbTiZr, HfMoTaTiZr, NbTaTiVZr, HfMoNbTaTiZr, HfMoTaTiVZr, and MoNbTaTiVZr.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1258464

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Vol. 67, Issue 11; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 108 works

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Giant Enhancement of Exchange Coupling in Entropy-Stabilized Oxide Heterostructures Meisenheimer, P. B.; Kratofil, T. J.; Heron, J. T. Scientific Reports, Vol. 7, Issue 1 https://doi.org/10.1038/s41598-017-13810-5	journal	October 2017
High-Entropy Metal Diborides: A New Class of High-Entropy Materials and a New Type of Ultrahigh Temperature Ceramics Gild, Joshua; Zhang, Yuanyao; Harrington, Tyler Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep37946	journal	November 2016
High-entropy alloys: a critical assessment of their founding principles and future prospects Pickering, E. J.; Jones, N. G. International Materials Reviews, Vol. 61, Issue 3 https://doi.org/10.1080/09506608.2016.1180020	journal	April 2016
Computational modeling of high-entropy alloys: Structures, thermodynamics and elasticity Gao, Michael C.; Gao, Pan; Hawk, Jeffrey A. Journal of Materials Research, Vol. 32, Issue 19 https://doi.org/10.1557/jmr.2017.366	journal	October 2017
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Development and exploration of refractory high entropy alloys—A review Senkov, Oleg N.; Miracle, Daniel B.; Chaput, Kevin J. Journal of Materials Research, Vol. 33, Issue 19 https://doi.org/10.1557/jmr.2018.153	journal	June 2018
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Solidification Microstructures of the Ingots Obtained by Arc Melting and Cold Crucible Levitation Melting in TiNbTaZr Medium-Entropy Alloy and TiNbTaZrX (X = V, Mo, W) High-Entropy Alloys Nagase, Takeshi; Mizuuchi, Kiyoshi; Nakano, Takayoshi Entropy, Vol. 21, Issue 5 https://doi.org/10.3390/e21050483	journal	May 2019
Novel Ultralight-Weight Complex Concentrated Alloys with High Strength Jia, Yuefei; Jia, Yandong; Wu, Shiwei Materials, Vol. 12, Issue 7 https://doi.org/10.3390/ma12071136	journal	April 2019
Influence of Cr Substitution and Temperature on Hierarchical Phase Decomposition in the AlCoFeNi High Entropy Alloy Chaudhary, V.; Gwalani, B.; Soni, V. Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-33922-w	journal	October 2018
The Effects of Mo and Nb on the Microstructures and Properties of CrFeCoNi(Nb,Mo) Alloys Tsau, Chun-Huei; Tsai, Meng-Chi Entropy, Vol. 20, Issue 9 https://doi.org/10.3390/e20090648	journal	August 2018

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