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Hexagonal Closed-Packed Precipitation Enhancement in a NbTiHfZr Refractory High-Entropy Alloy

1
Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China
2
School of Materials Science and Engineer, Zhejiang University, Hangzhou 310027, China
3
Center for Advanced Solidification Technology (CAST), School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(5), 485; https://doi.org/10.3390/met9050485
Received: 28 March 2019 / Revised: 15 April 2019 / Accepted: 23 April 2019 / Published: 26 April 2019
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Abstract

A NbTiHfZr high-entropy alloy (HEA) with a main phase of body-centered cubic structure is fabricated. Some hexagonal closed-packed (hcp) precipitates are observed in this alloy. A thermal-mechanical process, i.e., cold-rolling followed by annealing, can manipulate the volume fraction of the hcp nano-precipitates that can enhance strength and ductility. The enhancement is tailorable as a function of the volume fraction of the hcp nano-precipitate. The results indicate that the strength-ductility property can be manipulated via adjusting post-deformation heat-treatment methods, which provide a new strategy by utilizing metastability at high-temperature to design high strength refractory HEAs (RHEAs) without lost in ductility. View Full-Text
Keywords: high-entropy alloy; cold-rolling; annealing; ductility; nano-precipitation particle high-entropy alloy; cold-rolling; annealing; ductility; nano-precipitation particle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ma, Y.; Wu, S.; Jia, Y.; Hu, P.; Bu, Y.; Chen, X.; Wang, G.; Liu, J.; Wang, H.; Zhai, Q. Hexagonal Closed-Packed Precipitation Enhancement in a NbTiHfZr Refractory High-Entropy Alloy. Metals 2019, 9, 485.

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