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Title: Pressure-induced phase transitions in HoDyYGdTb high-entropy alloy

Authors:
ORCiD logo; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1397642
Grant/Contract Number:
FE-0008855; FE-0024054; FE-0011194
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Materials Letters
Additional Journal Information:
Journal Volume: 196; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:31:26; Journal ID: ISSN 0167-577X
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Yu, P. F., Zhang, L. J., Ning, J. L., Ma, M. Z., Zhang, X. Y., Li, Y. C., Liaw, P. K., Li, G., and Liu, R. P. Pressure-induced phase transitions in HoDyYGdTb high-entropy alloy. Netherlands: N. p., 2017. Web. doi:10.1016/j.matlet.2017.02.136.
Yu, P. F., Zhang, L. J., Ning, J. L., Ma, M. Z., Zhang, X. Y., Li, Y. C., Liaw, P. K., Li, G., & Liu, R. P. Pressure-induced phase transitions in HoDyYGdTb high-entropy alloy. Netherlands. doi:10.1016/j.matlet.2017.02.136.
Yu, P. F., Zhang, L. J., Ning, J. L., Ma, M. Z., Zhang, X. Y., Li, Y. C., Liaw, P. K., Li, G., and Liu, R. P. Thu . "Pressure-induced phase transitions in HoDyYGdTb high-entropy alloy". Netherlands. doi:10.1016/j.matlet.2017.02.136.
@article{osti_1397642,
title = {Pressure-induced phase transitions in HoDyYGdTb high-entropy alloy},
author = {Yu, P. F. and Zhang, L. J. and Ning, J. L. and Ma, M. Z. and Zhang, X. Y. and Li, Y. C. and Liaw, P. K. and Li, G. and Liu, R. P.},
abstractNote = {},
doi = {10.1016/j.matlet.2017.02.136},
journal = {Materials Letters},
number = C,
volume = 196,
place = {Netherlands},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.matlet.2017.02.136

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  • High-entropy alloys, near-equiatomic solid solutions of five or more elements, represent a new strategy for the design of materials with properties superior to those of conventional alloys. However, their phase space remains constrained, with transition metal high-entropy alloys exhibiting only face- or body-centered cubic structures. Here, we report the high-pressure synthesis of a hexagonal close-packed phase of the prototypical high-entropy alloy CrMnFeCoNi. This martensitic transformation begins at 14 GPa and is attributed to suppression of the local magnetic moments, destabilizing the initial fcc structure. Similar to fcc-to-hcp transformations in Al and the noble gases, the transformation is sluggish, occurring overmore » a range of >40 GPa. However, the behaviour of CrMnFeCoNi is unique in that the hcp phase is retained following decompression to ambient pressure, yielding metastable fcc-hcp mixtures. This demonstrates a means of tuning the structures and properties of high-entropy alloys in a manner not achievable by conventional processing techniques.« less
  • High pressure x-ray diffraction measurements reveal that the face-centered cubic (fcc) high-entropy alloy CrMnFeCoNi transforms martensitically to a hexagonal close-packed (hcp) phase at ~14 GPa. We attribute this to suppression of the local magnetic moments, destabilizing the fcc phase. Similar to fcc-to-hcp transformations in Al and the noble gases, this transformation is sluggish, occurring over a range of >40 GPa. But, the behavior of CrMnFeCoNi is unique in that the hcp phase is retained following decompression to ambient pressure, yielding metastable fcc-hcp mixtures.
  • High-entropy alloys, near-equiatomic solid solutions of five or more elements, represent a new strategy for the design of materials with properties superior to those of conventional alloys. However, their phase space remains constrained, with transition metal high-entropy alloys exhibiting only face- or body-centered cubic structures. Here, we report the high-pressure synthesis of a hexagonal close-packed phase of the prototypical high-entropy alloy CrMnFeCoNi. This martensitic transformation begins at 14 GPa and is attributed to suppression of the local magnetic moments, destabilizing the initial fcc structure. Similar to fcc-to-hcp transformations in Al and the noble gases, the transformation is sluggish, occurring overmore » a range of >40 GPa. However, the behaviour of CrMnFeCoNi is unique in that the hcp phase is retained following decompression to ambient pressure, yielding metastable fcc-hcp mixtures. This demonstrates a means of tuning the structures and properties of high-entropy alloys in a manner not achievable by conventional processing techniques.« less
  • A pressure-induced phase transition from the fcc to a hexagonal close-packed (hcp) structure was found in NiCoCrFe solid solution alloy starting at 13.5 GPa. The phase transition is very sluggish and the transition did not complete at ~40 GPa. The hcp structure is quenchable to ambient pressure. Only a very small amount (<5%) of hcp phase was found in the isostructural NiCoCr ternary alloy up to the pressure of 45 GPa and no obvious hcp phase was found in NiCoCrFePd system till to 74 GPa. Ab initio Gibbs free energy calculations indicated the energy differences between the fcc and themore » hcp phases for the three alloys are very small, but they are sensitive to temperature. The critical transition pressure in NiCoCrFe varies from ~1 GPa at room temperature to ~6 GPa at 500 K.« less
  • In this research, pressure-induced phase transition from the fcc to a hexagonal close-packed (hcp) structure wasfound in NiCoCrFe solid solution alloy starting at 13.5 GPa. The phase transition is very sluggish and the transition did not complete at ~ 40 GPa. The hcp structure is quenchable to ambient pressure. Only a very small amount (<5%) of hcp phase was found in the isostructural NiCoCr ternary alloy up to the pressure of 45 GPa and no obvious hcp phase was found in NiCoCrFePd system till to 74 GPa. Ab initio Gibbs free energy calculations indicated the energy differences between the fccmore » and the hcp phases for the three alloys are very small, but they are sensitive to temperature. Finally, the critical transition pressure in NiCoCrFe varies from 1 GPa at room temperature to 6 GPa at 500 K.« less