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Title: Senary refractory high-entropy alloy Cr xMoNbTaVW

Abstract

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.

Authors:
 [1];  [2];  [1];  [1]
  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.
Zhang, B., Gao, M. C., Zhang, Y., & Guo, S. M. Senary refractory high-entropy alloy CrxMoNbTaVW. United States. doi:10.1016/j.calphad.2015.09.007.
Zhang, B., Gao, M. C., Zhang, Y., and Guo, S. M. Wed . "Senary refractory high-entropy alloy CrxMoNbTaVW". United States. doi:10.1016/j.calphad.2015.09.007. https://www.osti.gov/servlets/purl/1482329.
@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 = {2015},
month = {11}
}

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Cited by: 12 works
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