High-entropy alloys

George, Easo P.; Raabe, Dierk; Ritchie, Robert O.

doi:10.1038/s41578-019-0121-4

Title: High-entropy alloys

Abstract

We present that alloying has long been used to confer desirable properties to materials. Typically, it involves the addition of relatively small amounts of secondary elements to a primary element. For the past decade and a half, however, a new alloying strategy that involves the combination of multiple principal elements in high concentrations to create new materials called high-entropy alloys has been in vogue. The multi-dimensional compositional space that can be tackled with this approach is practically limitless, and only tiny regions have been investigated so far. Nevertheless, a few high-entropy alloys have already been shown to possess exceptional properties, exceeding those of conventional alloys, and other outstanding high-entropy alloys are likely to be discovered in the future. In this paper, we review recent progress in understanding the salient features of high-entropy alloys. Model alloys whose behaviour has been carefully investigated are highlighted and their fundamental properties and underlying elementary mechanisms discussed. Finally, we also address the vast compositional space that remains to be explored and outline fruitful ways to identify regions within this space where high-entropy alloys with potentially interesting properties may be lurking.

Authors:

^[1]; Raabe, Dierk ^[2];

^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Max-Planck-Institut für Eisenforschung, Düsseldorf (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Publication Date:: Tue Jun 18 00:00:00 EDT 2019

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

OSTI Identifier:: 1550755

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Nature Reviews. Materials

Additional Journal Information:: Journal Volume: 4; Journal Issue: 8; Journal ID: ISSN 2058-8437

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    George, Easo P., Raabe, Dierk, and Ritchie, Robert O. High-entropy alloys.  United States: N. p., 2019. 
Web.  doi:10.1038/s41578-019-0121-4.

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                    George, Easo P., Raabe, Dierk, & Ritchie, Robert O. High-entropy alloys.  United States.  https://doi.org/10.1038/s41578-019-0121-4

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                    George, Easo P., Raabe, Dierk, and Ritchie, Robert O. Tue .  
"High-entropy alloys".  United States.  https://doi.org/10.1038/s41578-019-0121-4.  https://www.osti.gov/servlets/purl/1550755.

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@article{osti_1550755,

  title        = {High-entropy alloys},

  author       = {George, Easo P. and Raabe, Dierk and Ritchie, Robert O.},

  abstractNote = {We present that alloying has long been used to confer desirable properties to materials. Typically, it involves the addition of relatively small amounts of secondary elements to a primary element. For the past decade and a half, however, a new alloying strategy that involves the combination of multiple principal elements in high concentrations to create new materials called high-entropy alloys has been in vogue. The multi-dimensional compositional space that can be tackled with this approach is practically limitless, and only tiny regions have been investigated so far. Nevertheless, a few high-entropy alloys have already been shown to possess exceptional properties, exceeding those of conventional alloys, and other outstanding high-entropy alloys are likely to be discovered in the future. In this paper, we review recent progress in understanding the salient features of high-entropy alloys. Model alloys whose behaviour has been carefully investigated are highlighted and their fundamental properties and underlying elementary mechanisms discussed. Finally, we also address the vast compositional space that remains to be explored and outline fruitful ways to identify regions within this space where high-entropy alloys with potentially interesting properties may be lurking.},

  doi          = {10.1038/s41578-019-0121-4},

  journal      = {Nature Reviews. Materials},

  number       = 8,

  volume       = 4,

  place        = {United States},

  year         = {Tue Jun 18 00:00:00 EDT 2019},

  month        = {Tue Jun 18 00:00:00 EDT 2019}

}

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