Exceptional hardness in multiprincipal element alloys via hierarchical oxygen heterogeneities. Beaudry, D. C., Waters, M. J., Valentino, G. M., Foley, D. L., Anber, E., Rakita, Y., Brandenburg, C. J., Couzinié, J., Perrière, L., Aoki, T., Knipling, K. E., Callahan, P. G., Redemann, B. W., McQueen, T. M., Opila, E. J., Rondinelli, J. M., & Taheri, M. L. 10(38):eado9697. Publisher: American Association for the Advancement of Science![Exceptional hardness in multiprincipal element alloys via hierarchical oxygen heterogeneities [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Refractory multiprincipal element alloys (RMPEAs) are potential successors to incumbent high-temperature structural alloys, although efforts to improve oxidation resistance with large additions of passivating elements have led to embrittlement. RMPEAs containing group IV and V elements have a balance of properties including moderate ductility, low density, and the necessary formability. We find that oxidation of group IV-V RMPEAs induces hierarchical heterogeneities, ranging from nanoscale interstitial complexes to tertiary phases. This microstructural hierarchy considerably enhances hardness without indentation cracking, with values ranging between 12.1 and 22.6 GPa from the oxide-adjacent metal to the surface oxides, a 3.7 to 6.8× increase over the interstitial-free alloy. Our fundamental understanding of the oxygen influence on phase formation informs future alloy design to enhance oxidation resistance and obtain exceptional hardness while preserving plasticity.
@article{beaudry_exceptional_2024,
title = {Exceptional hardness in multiprincipal element alloys via hierarchical oxygen heterogeneities},
volume = {10},
url = {https://www.science.org/doi/10.1126/sciadv.ado9697},
doi = {10.1126/sciadv.ado9697},
abstract = {Refractory multiprincipal element alloys ({RMPEAs}) are potential successors to incumbent high-temperature structural alloys, although efforts to improve oxidation resistance with large additions of passivating elements have led to embrittlement. {RMPEAs} containing group {IV} and V elements have a balance of properties including moderate ductility, low density, and the necessary formability. We find that oxidation of group {IV}-V {RMPEAs} induces hierarchical heterogeneities, ranging from nanoscale interstitial complexes to tertiary phases. This microstructural hierarchy considerably enhances hardness without indentation cracking, with values ranging between 12.1 and 22.6 {GPa} from the oxide-adjacent metal to the surface oxides, a 3.7 to 6.8× increase over the interstitial-free alloy. Our fundamental understanding of the oxygen influence on phase formation informs future alloy design to enhance oxidation resistance and obtain exceptional hardness while preserving plasticity.},
pages = {eado9697},
number = {38},
journaltitle = {Science Advances},
author = {Beaudry, David C. and Waters, Michael J. and Valentino, Gianna M. and Foley, Daniel L. and Anber, Elaf and Rakita, Yevgeny and Brandenburg, Charlie J. and Couzinié, Jean-Philippe and Perrière, Loïc and Aoki, Toshihiro and Knipling, Keith E. and Callahan, Patrick G. and Redemann, Benjamin W.Y. and {McQueen}, Tyrel M. and Opila, Elizabeth J. and Rondinelli, James M. and Taheri, Mitra L.},
urldate = {2024-10-10},
date = {2024-09-20},
note = {Publisher: American Association for the Advancement of Science},
file = {Full Text PDF:/Users/yevgenyr/Zotero/storage/JTSF3YMF/Beaudry et al. - 2024 - Exceptional hardness in multiprincipal element all.pdf:application/pdf},
}
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This microstructural hierarchy considerably enhances hardness without indentation cracking, with values ranging between 12.1 and 22.6 GPa from the oxide-adjacent metal to the surface oxides, a 3.7 to 6.8× increase over the interstitial-free alloy. 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