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

Y. J. Zhao; J. W. Qiao; S. G. Ma; M. C. Gao; H. J. Yang; M. W. Chen; Y. Zhang

doi:10.1016/j.matdes.2016.01.149

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

Y. J. Zhao, J. W. Qiao, S. G. Ma, M. C. Gao, H. J. Yang, M. W. Chen, Y. Zhang

Research output: Contribution to journal › Article › peer-review

170 Citations (Scopus)

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.

Original language	English
Pages (from-to)	10-15
Number of pages	6
Journal	Materials and Design
Volume	96
DOIs	https://doi.org/10.1016/j.matdes.2016.01.149
Publication status	Published - 2016 Apr 15

Keywords

Hexagonal close-packed structure
High-entropy alloys
Lattice distortion
Phase diagram
Rule of mixture

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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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.",

keywords = "Hexagonal close-packed structure, High-entropy alloys, Lattice distortion, Phase diagram, Rule of mixture",

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 Y. Zhang",

note = "Funding Information: The authors would like to acknowledge the financial support of National Natural Science Foundation of China (Nos. 51371122 and 51501123 ), the Program for the Innovative Talents of Higher Learning Institutions of Shanxi (2013), the Youth Natural Science Foundation of Shanxi Province, China (Nos. 2015021005 , 2015021006 , and 2014021017-3 ), and the financial support from State Key Lab of Advanced Metals and Materials (No. 2015-Z07 ). M.C.G. acknowledges financial support by the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL) through NETL's Office of Research and Development's Innovative Process Technologies (IPT) Field Work Proposal under the RES contract DE-FE-0004000 . ",

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doi = "10.1016/j.matdes.2016.01.149",

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volume = "96",

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TY - JOUR

T1 - A hexagonal close-packed high-entropy alloy

T2 - The effect of entropy

AU - Zhao, Y. J.

AU - Qiao, J. W.

AU - Ma, S. G.

AU - Gao, M. C.

AU - Yang, H. J.

AU - Chen, M. W.

AU - Zhang, Y.

N1 - Funding Information: The authors would like to acknowledge the financial support of National Natural Science Foundation of China (Nos. 51371122 and 51501123 ), the Program for the Innovative Talents of Higher Learning Institutions of Shanxi (2013), the Youth Natural Science Foundation of Shanxi Province, China (Nos. 2015021005 , 2015021006 , and 2014021017-3 ), and the financial support from State Key Lab of Advanced Metals and Materials (No. 2015-Z07 ). M.C.G. acknowledges financial support by the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL) through NETL's Office of Research and Development's Innovative Process Technologies (IPT) Field Work Proposal under the RES contract DE-FE-0004000 .

PY - 2016/4/15

Y1 - 2016/4/15

N2 - 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.

AB - 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.

KW - Hexagonal close-packed structure

KW - High-entropy alloys

KW - Lattice distortion

KW - Phase diagram

KW - Rule of mixture

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