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On single-phase status and segregation of an as-solidified septenary refractory high entropy alloy

  • Boliang Zhang (a1), Yang Mu (a1), M.C. Gao (a2), W.J. Meng (a1) and S.M. Guo (a1)...

Abstract

Phase predictions and characterizations on as-solidified septenary refractory high-entropy alloy, CrMoNbReTaVW, are presented. The simulated solidification process predicts a single body-centered-cubic (BCC) crystal structure with the tendency of compositional segregation. X-ray diffraction results confirm the “single-phase-like” BCC structure, while further experimental characterizations reveal the existence of multiple grains with significantly different compositions yet the same crystal structure and similar lattice parameters.

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Corresponding author

Address all correspondences to S.M. Guo at sguo2@lsu.edu

References

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1. Yeh, J.W., Chen, S.K., Lin, S.J., Gan, J.Y., Chin, T.S., Shun, T.T., Tsau, C.H., and Chang, S.Y.: Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Adv. Eng. Mater. 6, 299 (2004).
2. Sheng, G. and LIU, C.T.: Phase stability in high entropy alloys: formation of solid-solution phase or amorphous phase. Progr. Nat. Sci.: Mater. Int. 21, 433 (2011).
3. Anand, G., Goodall, R., and Freeman, C.L.: Role of configurational entropy in body-centred cubic or face-centred cubic phase formation in high entropy alloys. Scr. Mater. 124, 90 (2016).
4. Lucas, M., Wilks, G., Mauger, L., Munoz, J.A., Senkov, O., Michel, E., Horwath, J., Semiatin, S., Stone, M.B., and Abernathy, D.L.: Absence of long-range chemical ordering in equimolar FeCoCrNi. Appl. Phys. Lett. 100, 251907 (2012).
5. Cantor, B., Chang, I., Knight, P., and Vincent, A.: Microstructural development in equiatomic multicomponent alloys. Mater. Sci. Eng. A 375, 213 (2004).
6. Senkov, O., Wilks, G., Scott, J., and Miracle, D.: Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys. Intermetallics 19, 698 (2011).
7. Senkov, O.N., Wilks, G.B., Miracle, D.B., Chuang, C.P., and Liaw, P.K.: Refractory high-entropy alloys. Intermetallics 18, 1758 (2010).
8. Senkov, O., Scott, J., Senkova, S., Miracle, D., and Woodward, C.: Microstructure and room temperature properties of a high-entropy TaNbHfZrTi alloy. J. Alloys Compd. 509, 6043 (2011).
9. Kozak, R., Sologubenko, A., and Steurer, W.: Single-phase high-entropy alloys–an overview. Z. Kristallogr. – Crystall. Mater. 230, 55 (2015).
10. Dahlborg, U., Cornide, J., Calvo-Dahlborg, M., Hansen, T.C., Fitch, A., Leong, Z., Chambreland, S., and Goodall, R.: Structure of some CoCrFeNi and CoCrFeNiPd multicomponent HEA alloys by diffraction techniques. J. Alloys Compd. 681, 330 (2016).
11. Otto, F., Dlouhý, A., Pradeep, K.G., Kuběnová, M., Raabe, D., Eggeler, G., and George, E.P.: Decomposition of the single-phase high-entropy alloy CrMnFeCoNi after prolonged anneals at intermediate temperatures. Acta Mater. 112, 40 (2016).
12. Poletti, M.G., Branz, S., Fiore, G., Szost, B.A., Crichton, W.A., and Battezzati, L.: Equilibrium high entropy phases in X-NbTaTiZr (X = Al, V, Cr and Sn) multiprincipal component alloys. J. Alloys Compd. 655, 138 (2016).
13. Lin, C.-M. and Tsai, H.-L.: Equilibrium phase of high-entropy FeCoNiCrCu0.5 alloy at elevated temperature. J. Alloys Compd. 489, 30 (2010).
14. Pickering, E.J., Muñoz-Moreno, R., Stone, H.J., and Jones, N.G.: Precipitation in the equiatomic high-entropy alloy CrMnFeCoNi. Scr. Mater. 113, 106 (2016).
15. He, F., Wang, Z., Wu, Q., Li, J., Wang, J., and Liu, C.T.: Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures. Scr. Mater. 126, 15 (2017).
16. Saunders, N. and Miodownik, A.P.: CALPHAD (Calculation of Phase Diagrams): a Comprehensive Guide (Elsevier, Oxford, 1998).
17. Zhang, B., Gao, M., Zhang, Y., Yang, S., and Guo, S.: Senary refractory high entropy alloy MoNbTaTiVW. Mater. Sci. Technol., 1743284715Y. 0000000031 (2015).
18. Gao, M., Zhang, B., Yang, S., and Guo, S.: Senary Refractory High-Entropy Alloy HfNbTaTiVZr. Metall. Mater. Trans. A 47, 33333345 (2016).
19. Zhang, B., Gao, M., Zhang, Y., and Guo, S.: Senary refractory high-entropy alloy CrxMoNbTaVW. Calphad 51, 193 (2015).
20. Gulliver, G.: The quantitative effect of rapid cooling upon the constitution of binary alloys. J. Inst. Met. 13, 263 (1915).
21. Porter, D.A. and Easterling, K.E.: Phase Transformations in Metals and Alloys, 2nd ed. (CRC Press, Boca Raton, Florida, 2004).
22. Cullity, B.D. and Stock, S.R.: Elements of X-Ray Diffraction, 3rd ed. (Prentice-Hall, Upper Saddle River, New Jersey, 2001).

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