Microstructure and Properties of the Co₂NiWV_0.5Mo_1.5, Co₂NiWV_0.5Mo₂, and Co₂NiWV_1.0Mo₂ Multi-Principal Elements Alloys

Abstract:

The Co₂NiWV_0.5Mo_1.5, Co₂NiWV_0.5Mo₂ and Co₂NiWV_1.0Mo₂ multi-principal elements alloys were prepared by vacuum arc melting. The microstructure, compressive property and corrosion resistance of the alloys were investigated by means of X-ray diffraction, scanning electron microscope with energy dispersive spectroscopy, electrochemical workstation and material testing machine. Results indicated that all of these alloys were composed of primary dendrite with BCC structure. Inter-dendrite regions were filled with irregular and lamellar eutectics with a mixture of FCC solid solution and Co₇Mo₆-type μ phase. Compression tests indicated that fracture strength of Co₂NiMo₂V_1.0W, Co₂NiMo₂V_0.5W and Co₂NiMo_1.5V_0.5W alloys was 2308MPa, 1983MPa and 1861MPa, respectively. The solid-solution strengthening of BCC matrix and μ phase were the two main factors to strengthen the alloys. Alloys corrosion resistance showed the alloy with higher Mo or lower V content has better corrosion resistance.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 622-627
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.622
• Online since: June 2017
• Authors: Hui Jiang, Lin Ge Han, Xiao Xue Chang, Yi Ping Lu*, Ting Ju Li
• Keywords: Corrosion Resistance, Mechanical Properties, Microstructure

References

[1] B. Cantor, I. T. H. Chang, P. Knight, A. J. B. Vincent, Microstructural development in equiatomic multicomponent alloys, Mater. Sci. Eng. A. 375-377 (2004) 213-218.

DOI: 10.1016/j.msea.2003.10.257

[2] J.W. Yeh, S.K. Chen, S.J. Lin, J.Y. Gan, T.S. Chin, T.T. Shun, C.H. Tsau, S.Y. Chang, Nanostructured High‐Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes, Adv. Eng. Mater. 6 (2004) 299-303.

DOI: 10.1002/adem.200300567

[3] M. H. Tsai Physical Properties of High Entropy Alloys. Entropy. 15 (2013) 5338-5345.

DOI: 10.3390/e15125338

[4] J. Y. He, H. Wang, H. L. Huang, X. D. Xu, M. W. Chen, Y. Wu, X. J. Liu, T. G. Nieh, K. An, Z. P. Lu. A precipitation-hardened high-entropy alloy with outstanding tensile properties. Acta Mater. 102 (2016) 187-196.

DOI: 10.1016/j.actamat.2015.08.076

[5] L. Jiang, H. Jiang, Y. P. Lu, T. M. Wang, Z. Q. Cao, T. J. Li. Mechanical Properties Improvement of AlCrFeNi2Ti0. 5 High Entropy Alloy through Annealing Design and its Relationship with its Particle-reinforced Microstructures. J. Mater. Sci. Technol. 31 (2015).

DOI: 10.1016/j.jmst.2014.09.011

[6] Z. Wang, S. Guo, Q. Wang, Z. Liu, J. Wang, Y. Yang, C. T. Liu. Nanoindentation characterized initial creep behavior of a high-entropy-based alloy CoFeNi. Intermetallics. 53 (2014) 183-186.

DOI: 10.1016/j.intermet.2014.05.007

[7] P. Kozelj, S. Vrtnik, A. Jelen, S. Jazbec, Z. Jaglicic, S. Maiti, M. Feuerbacher, W. Steurer, J. Dolinsek. Discovery of a superconducting high-entropy alloy. Phys Rev Lett. 113 (2014) 107001.

DOI: 10.1103/physrevlett.113.107001

[8] Y. P. Lu, Y. Dong, S. Guo, L. Jiang, H. J. Kang, T. M. Wang, B. Wen, Z. J. Wang, J. C. Jie, Z. Q. Cao, H. H. Ruan, T. J. Li. A promising new class of high-temperature alloys: eutectic high-entropy alloys. Sci Rep. 4 (2014) 6200.

DOI: 10.1038/srep06200

[9] W. H. Liu, Z. P. Lu, J. Y. He, J. H. Luan, Z. J. Wang, B. Liu, Y. Liu, M. W. Chen, C. T. Liu Ductile CoCrFeNiMox high entropy alloys strengthened by hard intermetallic phases. Acta Mater. 116 (2016) 332-342.

DOI: 10.1016/j.actamat.2016.06.063

[10] N. D. Stepanov, D. G. Shaysultanov, G. A. Salishchev, M. A. Tikhonovsky, E. E. Oleynik, A. S. Tortika, O. N. Senkov. Effect of V content on microstructure and mechanical properties of the CoCrFeMnNiVx high entropy alloys. J Alloys Compd. 628 (2015).

DOI: 10.1016/j.jallcom.2014.12.157

[11] F. He, Z. J. Wang, P. Cheng, Q. Wang, J. J. Li., Y. Y. Dang, J. C. Wang, C. T. Liu. Designing eutectic high entropy alloys of CoCrFeNiNbx. J Alloys Compd. 656 (2016) 284-289.

DOI: 10.1016/j.jallcom.2015.09.153

[12] H. Jiang, H.Z. Zhang, T.D. Huang, Y. P Lu , T.M. Wang, T.J. Li. Microstructures and mechanical properties of Co2MoxNi2VWx eutectic high entropy alloys. Mater Des. 109 (2016) 539-546.

DOI: 10.1016/j.matdes.2016.07.113

[13] H. Jiang, L. Jiang, K.M. Han, Y.P. Lu, T. M Wang, Z. Q Cao, Li T. J. Effects of Tungsten on Microstructure and Mechanical Properties of CrFeNiV0. 5Wx and CrFeNi2V0. 5Wx High-Entropy Alloys. J Mater Eng Perform. 24 (2015) 4594.

DOI: 10.1007/s11665-015-1767-8

[14] Y.L. Choua, J.W. Yeh, Shih H. C. The effect of molybdenum on the corrosion behaviour of the high-entropy alloys Co1. 5CrFeNi1. 5Ti0. 5Mox in aqueous environments. Corros Sci. 52 (2010) 2571-2581.

DOI: 10.1016/j.corsci.2010.04.004

[15] Y. J. Hsu, W. C. Chiang, J. K. Wu. Corrosion behavior of FeCoNiCrCux high-entropy alloys in 3. 5% sodium chloride solution. Mater Chem Phys. 92 (2005) 112-117.

DOI: 10.1016/j.matchemphys.2005.01.001

[16] M. A. Ameer, A. M. Fekry, F. E. T. Heakal Electrochemical behaviour of passive films on molybdenum-containing austenitic stainless steels in aqueous solutions. Electrochimi Acta. 50 (2004) 43-49.

DOI: 10.1016/j.electacta.2004.07.011