In the past decade, the concept of high-entropy alloys (HEAs) or multi-principal element alloys (MPEAs), which are composed of at least four principal elements, significantly expands the compositional space for alloy design. This concept can also be employed in the design of superelastic alloys to promote the development of this functional material field. Here, we report the orientation-dependent superelasticity of a metastable Fe-27.5Ni-16.5Co-10Al-2.2Ta-0.04B (at.%) HEA through in situ micropillar compression tests along ⟨001⟩, ⟨011⟩, and ⟨111⟩ orientations. Our results show that considerable superelastic strains can be achieved along the three orientations in the metastable HEA via a reversible martensitic transformation. Thermoelastic martensite with thin-plate morphology was observed under cryogenic conditions. This work demonstrates that the maximum superelastic strains vary with different orientations, and the ⟨001⟩-oriented specimen shows the largest superelastic strain. The superelastic strains along specific orientations are compared with theoretical values calculated from the lattice deformation method and the energy minimization theory, respectively. The limited number of martensite variants under compression testing may be responsible for the discrepancy that exists in the experimental and the two theoretically predicted transformation strains. This study may provide a feasible strategy for the design of superelastic HEAs with specific orientation for applications in microsystems.
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18 October 2021
Research Article|
October 21 2021
Orientation-dependent superelasticity of a metastable high-entropy alloy
Special Collection:
Metastable High Entropy Alloys
Cheng Zhang
;
Cheng Zhang
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
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Xin Wang
;
Xin Wang
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
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Mingjie Xu
;
Mingjie Xu
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
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Benjamin E. MacDonald
;
Benjamin E. MacDonald
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
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Rongjie Hong
;
Rongjie Hong
2
Physics and Astronomy Department, University of California
, Los Angeles, California 90095, USA
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Chaoyi Zhu
;
Chaoyi Zhu
3
Department of Materials Science and Engineering, Carnegie Mellon University
, Pittsburgh, Pennsylvania 15213, USA
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Xueying Dai;
Xueying Dai
4
Department of Biomedical Engineering, University of California Irvine
, Irvine, California 92697, USA
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Kenneth S. Vecchio
;
Kenneth S. Vecchio
5
Department of NanoEngineering, University of California San Diego
, La Jolla, California 92093-0448, USA
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Diran Apelian
;
Diran Apelian
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
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Horst Hahn
;
Horst Hahn
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
6
Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT)
, 76021 Karlsruhe, Germany
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Julie M. Schoenung
;
Julie M. Schoenung
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
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Enrique J. Lavernia
Enrique J. Lavernia
a)
1
Department of Materials Science and Engineering, University of California Irvine
, Irvine, California 92697-2585, USA
a)Author to whom correspondence should be addressed: lavernia@uci.edu
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a)Author to whom correspondence should be addressed: lavernia@uci.edu
Note: This paper is part of the APL Special Collection on Metastable High Entropy Alloys.
Appl. Phys. Lett. 119, 161908 (2021)
Article history
Received:
August 08 2021
Accepted:
October 05 2021
Citation
Cheng Zhang, Xin Wang, Mingjie Xu, Benjamin E. MacDonald, Rongjie Hong, Chaoyi Zhu, Xueying Dai, Kenneth S. Vecchio, Diran Apelian, Horst Hahn, Julie M. Schoenung, Enrique J. Lavernia; Orientation-dependent superelasticity of a metastable high-entropy alloy. Appl. Phys. Lett. 18 October 2021; 119 (16): 161908. https://doi.org/10.1063/5.0066130
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