Abstract
In the design of high-entropy alloys (HEAs) with desired properties, identifying the effects of elements plays an important role. HEAs with eutectic microstructure can be obtained by judiciously modifying the alloy compositions. In this study, the effect of Nb addition to FeCoNiCuNbx (x = 0.5, 5, 7.5, 11.6, 15) alloys was studied by varying the Nb concentration (at.%). FeCoNiCuNb0.5 HEA shows liquid phase separation to form Cu-rich and FeCoNiCu-rich phases. Detailed solidification paths are proposed for these alloys, which show eutectic, peritectic, and pseudo quasi-peritectic reactions. Increasing Nb content promotes the liquid phase separation tendency and causes the formation of Cu-rich spheres. The effect of Nb on the FeCoNiCu-rich phase was studied based on the nanoindentation and correlated with nanohardness. The compressive deformation properties of these alloys are studied at room temperature and high temperature and correlated with microstructure. Fractography results show the mode of fracture and are correlated with the microstructure obtained.
Similar content being viewed by others
References
W.H. Liu, Z.P. Lu, J.Y. He, J.H. Luan, Z.J. Wang, B. Liu, Y. Liu, M.W. Chen, and C.T. Liu: Ductile CoCrFeNiMox high entropy alloys strengthened by hard intermetallic phases. Acta Mater. 116, 332 (2016).
R.S. Ganji, P. Sai Karthik, K. Bhanu Sankara Rao, and K.V. Rajulapati: Strengthening mechanisms in equiatomic ultrafine grained AlCoCrCuFeNi high-entropy alloy studied by micro- and nanoindentation methods. Acta Mater. 125, 58 (2017).
W. Huo, H. Zhou, F. Fang, Z. Xie, and J. Jiang: Microstructure and mechanical properties of CoCrFeNiZrx eutectic high-entropy alloys. Mater. Des. 134, 226 (2017).
Y.H. Jo, S. Jung, W.M. Choi, S.S. Sohn, H.S. Kim, B.J. Lee, N.J. Kim, and S. Lee: Cryogenic strength improvement by utilizing room-temperature deformation twinning in a partially recrystallized VCrMnFeCoNi high-entropy alloy. Nat. Commun. 8, 1 (2017).
R.B. Nair, H.S. Arora, S. Mukherjee, S. Singh, H. Singh, and H.S. Grewal: Exceptionally high cavitation erosion and corrosion resistance of a high entropy alloy. Ultrason. Sonochem. 41, 252 (2018).
D.B. Miracle and O.N. Senkov: A critical review of high entropy alloys and related concepts. Acta Mater. 122, 448 (2016).
L. Zhang, Y. Zhou, X. Jin, X. Du, and B. Li: The microstructure and high-temperature properties of novel nano precipitation-hardened face centered cubic high-entropy superalloys. Scr. Mater. 146, 226 (2018).
Z. Li, K.G. Pradeep, Y. Deng, D. Raabe, and C.C. Tasan: Metastable high-entropy dual-phase alloys overcome the strength-ductility trade-off. Nature 534, 227 (2016).
F. He, Z. Wang, P. Cheng, Q. Wang, J. Li, Y. Dang, J. Wang, and C.T. Liu: Designing eutectic high entropy alloys of CoCrFeNiNbx. J. Alloys Compd. 656, 284 (2016).
Y. Tan, J. Li, J. Wang, M. Kolbe, and H. Kou: Microstructure characterization of CoCrFeNiMnPdx eutectic high-entropy alloys. J. Alloys Compd. 731, 600 (2018).
P.H. Wu, N. Liu, W. Yang, Z.X. Zhu, Y.P. Lu, and X.J. Wang: Microstructure and solidification behavior of multicomponent CoCrCuxFeMoNi high-entropy alloys. Mater. Sci. Eng., A 642, 142 (2015).
Z. Peng, N. Liu, S.Y. Zhang, P.H. Wu, and X.J. Wang: Liquid-phase separation of immiscible CrCuxFeMoyNi high-entropy alloys. Mater. Sci. Technol. 33, 1352 (2017).
F. He, Z. Wang, Q. Wu, J. Li, J. Wang, and C.T. Liu: Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures. Scr. Mater. 126, 15 (2017).
A. Munitz, M.J. Kaufman, and R. Abbaschian: Liquid phase separation in transition element high entropy alloys. Intermetallics 86, 59 (2017).
Y. Lu, H. Jiang, S. Guo, T. Wang, Z. Cao, and T. Li: A new strategy to design eutectic high-entropy alloys using mixing enthalpy. Intermetallics 91, 124 (2017).
R. Chen, G. Qin, H. Zheng, L. Wang, Y. Su, Y. Chiu, H. Ding, J. Guo, and H. Fu: Composition design of high entropy alloys using the valence electron concentration to balance strength and ductility. Acta Mater. 144, 129 (2018).
M. Beyramali Kivy, M. Asle Zaeem, and S. Lekakh: Investigating phase formations in cast AlFeCoNiCu high entropy alloys by combination of computational modeling and experiments. Mater. Des. 127, 224 (2017).
Y. Guo, L. Liu, Y. Zhang, J. Qi, B. Wang, Z. Zhao, J. Shang, and J. Xiang: A superfine eutectic microstructure and the mechanical properties of CoCrFeNiMox high-entropy alloys. J. Mater. Res. 33, 3258–3265 (2018).
W.L. Wang, L. Hu, S.B. Luo, L.J. Meng, D.L. Geng, and B. Wei: Liquid phase separation and rapid dendritic growth of high-entropy CoCrCuFeNi alloy. Intermetallics 77, 41 (2016).
F. He, Z. Wang, S. Niu, Q. Wu, J. Li, J. Wang, C.T. Liu, and Y. Dang: Strengthening the CoCrFeNiNb0.25 high entropy alloy by FCC precipitate. J. Alloys Compd. 667, 53 (2016).
V. Maier-Kiener, B. Schuh, E.P. George, H. Clemens, and A. Hohenwarter: Nanoindentation testing as a powerful screening tool for assessing phase stability of nanocrystalline high-entropy alloys. Mater. Des. 115, 479 (2017).
M.J. Jang, S. Praveen, H.J. Sung, J.W. Bae, J. Moon, and H.S. Kim: High-temperature tensile deformation behavior of hot rolled CrMnFeCoNi high-entropy alloy. J. Alloys Compd. 730, 242 (2018).
Y. Wu, J. Si, D. Lin, T. Wang, W.Y. Wang, Y. Wang, Z. Liu, and X. Hui: Phase stability and mechanical properties of AlHfNbTiZr high-entropy alloys. Mater. Sci. Eng., A 724, 249 (2018).
S. Samal, M.R. Rahul, R.S. Kottada, and G. Phanikumar: Hot deformation behaviour and processing map of Co—Cu—Fe—Ni—Ti eutectic high entropy alloy. Mater. Sci. Eng., A 664, 227 (2016).
I.S. Wani, T. Bhattacharjee, S. Sheikh, I.T. Clark, M.H. Park, T. Okawa, S. Guo, P.P. Bhattacharjee, and N. Tsuji: Cold-rolling and recrystallization textures of a nano-lamellar AlCoCrFeNi2.1 eutectic high entropy alloy. Intermetallics 84, 42 (2017).
S. Singh, N. Wanderka, B.S. Murty, U. Glatzel, and J. Banhart: Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy. Acta Mater. 59, 182 (2011).
M.R. Rahul, S. Samal, S. Venugopal, and G. Phanikumar: Experimental and finite element simulation studies on hot deformation behaviour of AlCoCrFeNi2.1 eutectic high entropy alloy. J. Alloys Compd. 749, 1115 (2018).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Rahul, M.R., Samal, S. & Phanikumar, G. Effect of niobium addition in FeCoNiCuNbx high-entropy alloys. Journal of Materials Research 34, 700–708 (2019). https://doi.org/10.1557/jmr.2019.36
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/jmr.2019.36