Senary refractory high-entropy alloy CrxMoNbTaVW

Zhang, B.; Gao, M. C.; Zhang, Y.; Guo, S. M.

doi:10.1016/j.calphad.2015.09.007

Senary refractory high-entropy alloy Cr_xMoNbTaVW

Journal Article · Wed Nov 11 00:00:00 EST 2015 · Calphad

DOI:https://doi.org/10.1016/j.calphad.2015.09.007· OSTI ID:1482329

Zhang, B. ^[1]; Gao, M. C. ^[2]; Zhang, Y. ^[1]; Guo, S. M. ^[1]

Louisiana State Univ., Baton Rouge, LA (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)

This paper demonstrates that a senary refractory high-entropy alloy Cr_xMoNbTaVW can be tailored over a certain range of Cr content with the BCC structure for different microstructures and physical properties, assisted by CALPHAD simulations. Microstructure characterizations are performed using X-ray diffraction and scanning electron microscopy. Chemical microsegregation during solidification predicted using the Scheil model generally agrees with the experimental results. The lattice constant, density, and Vickers’ micro-hardness of the highentropy alloy samples in the as-cast state are measured and discussed. For Cr_xMoNbTaVW, x=2.0 case appears exceeding the upper limit of maintaining a single BCC phase HEA, determined by the XRD patterns. The elemental dependence of the mixing thermodynamic properties (entropy, enthalpy and Gibbs energy) in BCC phase in the senary system is analyzed. The calculated entropy of mixing and enthalpy of mixing for CrMoNbTaVW are 14.7 J/K/mol and -662.5 J/mol respectively.

Research Organization:: National Energy Technology Lab. (NETL), Albany, OR (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0004000; FE0004734; FE0007220; FE0008382; FE0011550

OSTI ID:: 1482329

Alternate ID(s):: OSTI ID: 1249811

Journal Information:: Calphad, Journal Name: Calphad Journal Issue: C Vol. 51; ISSN 0364-5916

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A thermodynamic study of corrosion behaviors for CoCrFeNi-based high-entropy alloys Zhang, Boliang; Zhang, Yi; Guo, S. M. Journal of Materials Science, Vol. 53, Issue 20 https://doi.org/10.1007/s10853-018-2652-2	journal	July 2018
Microstructure and Mechanical Properties of (TiZrHf)50(NiCoCu)50 High Entropy Alloys Chen, Chih-Hsuan; Chen, Yue-Jin; Shen, Jia-Jyun Metals and Materials International https://doi.org/10.1007/s12540-019-00383-3	journal	July 2019
Rare-earth high entropy alloys with hexagonal close-packed structure Qiao, J. W.; Bao, M. L.; Zhao, Y. J. Journal of Applied Physics, Vol. 124, Issue 19 https://doi.org/10.1063/1.5051514	journal	November 2018
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
Current and emerging practices of CALPHAD toward the development of high entropy alloys and complex concentrated alloys Gorsse, Stéphane; Tancret, Franck Journal of Materials Research, Vol. 33, Issue 19 https://doi.org/10.1557/jmr.2018.152	journal	June 2018
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
Modeling the structure and thermodynamics of high-entropy alloys Widom, Michael Journal of Materials Research, Vol. 33, Issue 19 https://doi.org/10.1557/jmr.2018.222	journal	July 2018
MoNbTaV Medium-Entropy Alloy Yao, Hongwei; Qiao, Jun-Wei; Gao, Michael Entropy, Vol. 18, Issue 5 https://doi.org/10.3390/e18050189	journal	May 2016
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