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Title: A hexagonal close-packed high-entropy alloy: The effect of entropy

Abstract

The formation of disordered solid solution in the hexagonal close-packed (hcp) structure in the GdHoLaTbY alloy and its mechanical properties were investigated in this study. The single hcp phase of the alloy in the as-cast state was confirmed by X-ray diffraction and scanning electron microscopy analyses. The compressive yield strength, fracture strength, and plastic strain of the alloy are 108 MPa, 880 MPa, and 21.8 %, respectively, and the Vickers hardness is 96 HV. The results show that the yield strength, fracture strength, and hardness of the alloy obey the rule of mixture, which indicates that there is no hardening effect from entropy. Although the high entropy of mixing stabilizes the solid solution against intermetallic compounds, lack of severe lattice distortion from elastic strain or electronic interactions between principal elements impacts little on the mechanical properties.

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [4]
  1. Taiyuan Univ. of Technology (China)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
  3. Tohoku Univ., Sendai (Japan)
  4. Univ. of Science and Technology Beijing (China)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1482333
Grant/Contract Number:  
51371122; 51501123; 2015021005; 2015021006; 2014021017-3; 2015-Z07; FE-0004000
Resource Type:
Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 96; Journal Issue: C; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-entropy alloys; hexagonal close-packed structure; mechanical properties; yield strength; fracture strength; hardness; compression; lattice distortion; phase diagram; rule of mixture

Citation Formats

Zhao, Y. J., Qiao, J. W., Ma, S. G., Gao, M. C., Yang, H. J., Chen, M. W., and Zhang, Y. A hexagonal close-packed high-entropy alloy: The effect of entropy. United States: N. p., 2016. Web. doi:10.1016/j.matdes.2016.01.149.
Zhao, Y. J., Qiao, J. W., Ma, S. G., Gao, M. C., Yang, H. J., Chen, M. W., & Zhang, Y. A hexagonal close-packed high-entropy alloy: The effect of entropy. United States. doi:10.1016/j.matdes.2016.01.149.
Zhao, Y. J., Qiao, J. W., Ma, S. G., Gao, M. C., Yang, H. J., Chen, M. W., and Zhang, Y. Mon . "A hexagonal close-packed high-entropy alloy: The effect of entropy". United States. doi:10.1016/j.matdes.2016.01.149. https://www.osti.gov/servlets/purl/1482333.
@article{osti_1482333,
title = {A hexagonal close-packed high-entropy alloy: The effect of entropy},
author = {Zhao, Y. J. and Qiao, J. W. and Ma, S. G. and Gao, M. C. and Yang, H. J. and Chen, M. W. and Zhang, Y.},
abstractNote = {The formation of disordered solid solution in the hexagonal close-packed (hcp) structure in the GdHoLaTbY alloy and its mechanical properties were investigated in this study. The single hcp phase of the alloy in the as-cast state was confirmed by X-ray diffraction and scanning electron microscopy analyses. The compressive yield strength, fracture strength, and plastic strain of the alloy are 108 MPa, 880 MPa, and 21.8 %, respectively, and the Vickers hardness is 96 HV. The results show that the yield strength, fracture strength, and hardness of the alloy obey the rule of mixture, which indicates that there is no hardening effect from entropy. Although the high entropy of mixing stabilizes the solid solution against intermetallic compounds, lack of severe lattice distortion from elastic strain or electronic interactions between principal elements impacts little on the mechanical properties.},
doi = {10.1016/j.matdes.2016.01.149},
journal = {Materials & Design},
number = C,
volume = 96,
place = {United States},
year = {2016},
month = {2}
}

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