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Nanocrystalline High-Entropy Alloys: A New Paradigm in High-Temperature Strength and Stability
Open accessAbstract
Metals with nanometer-scale grains or nanocrystalline metals exhibit high strengths at ambient conditions, yet their strengths substantially decrease with increasing temperature, rendering them unsuitable for usage at high temperatures. Here, we show that a nanocrystalline high-entropy alloy (HEA) retains an extraordinarily high yield strength over 5 GPa up to 600 °C, 1 order of magnitude higher than that of its coarse-grained form and 5 times higher than that of its single-crystalline equivalent. As a result, such nanostructured HEAs reveal strengthening figures of merit-normalized strength by the shear modulus above 1/50 and strength-to-density ratios above 0.4 MJ/kg, which are substantially higher than any previously reported values for nanocrystalline metals in the same homologous temperature range, as well as low strain-rate sensitivity of ∼0.005. Nanocrystalline HEAs with these properties represent a new class of nanomaterials for high-stress and high-temperature applications in aerospace, civilian infrastructure, and energy sectors.
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Cited by
Synthesis of high-entropy alloy nanoparticles on supports by the fast moving bed pyrolysis
Gao, S., Hao, S., Huang, Z., Yuan, Y., Han, S., Lei, L., Zhang, X., Shahbazian-Yassar, R., & Lu, J. (2020) · Nature Communications · doi:10.1038/s41467-020-15934-1 · Cited by 533
Functional properties and promising applications of high entropy alloys
Yan, X., & Zhang, Y. (2020) · Scripta Materialia · doi:10.1016/j.scriptamat.2020.06.017 · Cited by 312
Mechanically alloyed high entropy alloys: existing challenges and opportunities
Kumar, A., Singh, A., & Suhane, A. (2022) · Journal of Materials Research and Technology · doi:10.1016/j.jmrt.2022.01.141 · Cited by 294
Metadata
- Authors
- Zou, Y., Wheeler, J. M., Ma, H., Okle, P., & Spolenak, R.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-02-09
- Volume
- 17
- Issue
- 3
- Pages
- 1569-1574
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2582876220
- Cited by
- 215
- References
- 0
- FWCI
- 14.14
- Type
- journal article
- Language
- en
- Open access
- green
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- Zou, Y., Wheeler, J. M., Ma, H., Okle, P., & Spolenak, R. (2017). Nanocrystalline High-Entropy Alloys: A New Paradigm in High-Temperature Strength and Stability. Nano Letters. https://doi.org/10.1021/acs.nanolett.6b04716
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