Thermal Stability of Microstructure of High-Entropy Alloys Based on Refractory Metals Hf, Nb, Ta, Ti, V, and Zr
Abstract
:1. Introduction
2. Materials and Methods
3. Experimental Details
4. Results and Discussion
4.1. NbTaTiZr Alloy
4.2. HfNbTaTiZr Alloy
4.3. HfNbTiVZr Alloy
4.4. HfNbTaTiVZr Alloy
4.5. Mechanical Properties of Alloys
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Composition | δ (%) | VEC | SSS ® | HSS (kJ/mol) | HV0.5 as-Cast | HV0.5 Annealed |
---|---|---|---|---|---|---|
NbTaTiZr | 4.83 | 4.5 | 1.39 | 1.75 | 371 ± 5 | 377 ± 5 |
HfNbTaTiZr | 4.98 | 4.4 | 1.61 | 1.60 | 354 ± 6 | 368 ± 5 |
HfNbTiVZr | 7.06 | 4.4 | 1.61 | 0.48 | 381 ± 5 | 370 ± 5 |
HfNbTaTiVZr | 6.58 | 4.5 | 1.79 | 0.78 | 418 ± 6 | 417 ± 5 |
Element | ri (Å) | Structure | Lattice Parameters (Å) | Temperature Range (°C) |
---|---|---|---|---|
Hf (α) | 1.56 | hcp | a = 3.196, c = 5.051 | <1995 °C |
Hf (β) | 1.56 | bcc | a = 3.610 | >1995 °C |
Nb | 1.43 | bcc | a = 3.300 | - |
Ta | 1.43 | bcc | a = 3.301 | - |
Ti (α) | 1.45 | hcp | a = 2.951, c = 4.686 | <882 °C |
Ti (β) | 1.43 | bcc | a = 3.306 | >882 °C |
V | 1.31 | bcc | a = 3.03 | - |
Zr (α) | 1.59 | hcp | a = 3.232, c = 5.147 | <865 °C |
Zr (β) | 1.56 | bcc | a = 3.609 | >865 °C |
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Vlasák, T.; Čížek, J.; Melikhova, O.; Lukáč, F.; Preisler, D.; Janeček, M.; Harcuba, P.; Zimina, M.; Srba, O. Thermal Stability of Microstructure of High-Entropy Alloys Based on Refractory Metals Hf, Nb, Ta, Ti, V, and Zr. Metals 2022, 12, 394. https://doi.org/10.3390/met12030394
Vlasák T, Čížek J, Melikhova O, Lukáč F, Preisler D, Janeček M, Harcuba P, Zimina M, Srba O. Thermal Stability of Microstructure of High-Entropy Alloys Based on Refractory Metals Hf, Nb, Ta, Ti, V, and Zr. Metals. 2022; 12(3):394. https://doi.org/10.3390/met12030394
Chicago/Turabian StyleVlasák, Tomáš, Jakub Čížek, Oksana Melikhova, František Lukáč, Dalibor Preisler, Miloš Janeček, Petr Harcuba, Mariia Zimina, and Ondřej Srba. 2022. "Thermal Stability of Microstructure of High-Entropy Alloys Based on Refractory Metals Hf, Nb, Ta, Ti, V, and Zr" Metals 12, no. 3: 394. https://doi.org/10.3390/met12030394