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Title: Senary refractory high-entropy alloy CrxMoNbTaVW

Abstract

This paper demonstrates that a senary refractory high-entropy alloy CrxMoNbTaVW 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 CrxMoNbTaVW, 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.

Authors:
 [1];  [2];  [1];  [1]
+ Show Author Affiliations
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1482329
Alternate Identifier(s):
OSTI ID: 1249811
Grant/Contract Number:  
OIA-1541079; FE0004734; FE0011550; FE0008382; FE0007220; FE-0004000
Resource Type:
Accepted Manuscript
Journal Name:
Calphad
Additional Journal Information:
Journal Volume: 51; Journal Issue: C; Journal ID: ISSN 0364-5916
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, B., Gao, M. C., Zhang, Y., and Guo, S. M. Senary refractory high-entropy alloy CrxMoNbTaVW. United States: N. p., 2015. Web. doi:10.1016/j.calphad.2015.09.007.
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Zhang, B., Gao, M. C., Zhang, Y., & Guo, S. M. Senary refractory high-entropy alloy CrxMoNbTaVW. United States. https://doi.org/10.1016/j.calphad.2015.09.007
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Zhang, B., Gao, M. C., Zhang, Y., and Guo, S. M. Wed . "Senary refractory high-entropy alloy CrxMoNbTaVW". United States. https://doi.org/10.1016/j.calphad.2015.09.007. https://www.osti.gov/servlets/purl/1482329.
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@article{osti_1482329,
title = {Senary refractory high-entropy alloy CrxMoNbTaVW},
author = {Zhang, B. and Gao, M. C. and Zhang, Y. and Guo, S. M.},
abstractNote = {This paper demonstrates that a senary refractory high-entropy alloy CrxMoNbTaVW 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 CrxMoNbTaVW, 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.},
doi = {10.1016/j.calphad.2015.09.007},
journal = {Calphad},
number = C,
volume = 51,
place = {United States},
year = {Wed Nov 11 00:00:00 EST 2015},
month = {Wed Nov 11 00:00:00 EST 2015}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.calphad.2015.09.007
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    Works referencing / citing this record:

    Current and emerging practices of CALPHAD toward the development of high entropy alloys and complex concentrated alloys
    journal, June 2018

    • Gorsse, Stéphane; Tancret, Franck
    • Journal of Materials Research, Vol. 33, Issue 19
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    Computational modeling of high-entropy alloys: Structures, thermodynamics and elasticity
    journal, October 2017

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    A thermodynamic study of corrosion behaviors for CoCrFeNi-based high-entropy alloys
    journal, July 2018

    Rare-earth high entropy alloys with hexagonal close-packed structure
    journal, November 2018

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    • Journal of Applied Physics, Vol. 124, Issue 19
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    Development and exploration of refractory high entropy alloys—A review
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    • Journal of Materials Research, Vol. 33, Issue 19
    • DOI: 10.1557/jmr.2018.153

    Design of Light-Weight High-Entropy Alloys
    journal, September 2016

    • Feng, Rui; Gao, Michael; Lee, Chanho
    • Entropy, Vol. 18, Issue 9
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    Modeling the structure and thermodynamics of high-entropy alloys
    journal, July 2018

    MoNbTaV Medium-Entropy Alloy
    journal, May 2016

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    High-entropy alloys: a critical assessment of their founding principles and future prospects
    journal, April 2016

    Microstructure and Mechanical Properties of (TiZrHf)50(NiCoCu)50 High Entropy Alloys
    journal, July 2019

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