Microstructure and Mechanical Properties of VTaTiMoAlx Refractory High Entropy Alloys


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A series of refractory high-entropy alloys VTaTiMoAlx with x=0,0.2,0.6,1.0 were designed and produced by vacuum arc melting. The effect of added Al elements on the microstructure and mechanical properties of refractory high-entropy alloys were investigated. The X-ray diffraction results showed that all the high-entropy alloys consist of simple BCC solid solution. SEM indicated that the microstructure of VTaTiMoAlx changes from equiaxial dendritic-like structure to typical dendrite structure with the addition of Al element. The composition of different regions in the alloys are obtained by energy dispersive spectroscopy and shows that Ta, Mo elements are enriched in the dendrite areas, and Al, Ti, V are enriched in inter-dendrite areas. The yield strength and compress strain reach maximum (σ0.2=1221MPa, ε=9.91%) at x=0, and decrease with the addition of Al element at room temperature. Vickers hardness of the alloys improves as the Al addition.



Edited by:

Yafang Han




D. X. Qiao et al., "Microstructure and Mechanical Properties of VTaTiMoAlx Refractory High Entropy Alloys", Materials Science Forum, Vol. 898, pp. 638-642, 2017

Online since:

June 2017




* - Corresponding Author

[1] J.W. Yeh, S.K. Chen, S.J. Lin J.Y. G., T.S. Chin, T.T. Shun, C.H. Tsau, S. Y. C. Nanostructured high entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Advanced Engineering Materials. 2004, 6: 299-303.

DOI: https://doi.org/10.1002/adem.200300567

[2] Cantor B., Chang I. T. H., Knight P., Vincent A. J. B. Microstructural development in equiatomic multicomponent alloys. Materials Science and Engineering: A. 2004, 375-377: 213-218.

DOI: https://doi.org/10.1016/j.msea.2003.10.257

[3] Zhang Y., Zhou Y. J., Lin J. P., Chen G. L., Liaw P. K. Solid-solution phase formation rules for multi-component alloys. Adv. Eng. Mater. 2008; 10(6): 534-538.

DOI: https://doi.org/10.1002/adem.200700240

[4] Gao M. C., Carney C. S., Doğan Ö. N., Jablonksi P. D., Hawk J. A., Alman D. E. Design of refractory high-entropy alloys. JOM. 2015, 67(11): 2653-2669.

DOI: https://doi.org/10.1007/s11837-015-1617-z

[5] Tsai M. H. Physical Properties of High Entropy Alloys. Entropy. 2013, 15: 5338-5345.

DOI: https://doi.org/10.3390/e15125338

[6] Zhou Y. J., Zhang Y., Wang Y. L., Chen G. L. Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties. Appl. Phys. Lett. 2007, 90(18): 181904.

DOI: https://doi.org/10.1063/1.2734517

[7] Tsao T. K., Yeh A. C., Kuo C. M., & Murakami H. High Temperature Oxidation and Corrosion Properties of High Entropy Superalloys. Entropy. 2016, 18(2): 62.

DOI: https://doi.org/10.3390/e18020062

[8] Poulia A., Georgatis E., Lekatou A. Karantzalis A. E. Microstructure and wear behavior of a refractory high entropy alloy. International Journal of Refractory Metals and Hard Materials. 2016, 57: 50-63.

DOI: https://doi.org/10.1016/j.ijrmhm.2016.02.006

[9] C.Y. Hsua, C.C. Juana W.R. Wangb, T.S. Sheuc, J.W. Yeha, S.K. Chen, On the superior hot hardness and softening resistance of AlCoCrxFeMo0. 5Ni high-entropy alloys, Mater. Sci. Eng. 2011, A 528(10-11): 3581-3588.

[10] Senkov O. N., Scott J. M., Senkova S. V., Miracle D. B., Woodward C. F. Microstructure and room temperature properties of a high-entropy TaNbHfZrTi alloy. Journal of alloys and compounds. 2011, 509(20): 6043-6048.

DOI: https://doi.org/10.1016/j.jallcom.2011.02.171

[11] Senkov, O. N., Wilks G. B., Scott J. M., Miracle D. B. Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys. Intermetallics. 2011, 19(5): 698-706.

DOI: https://doi.org/10.1016/j.intermet.2011.01.004

[12] Senkov O. N., Wilks G. B., Miracle D. B., Chuang C. P., Liaw P. K. Refractory high-entropy alloys. Intermetallics. 2010, 18(9): 1758-1765.

DOI: https://doi.org/10.1016/j.intermet.2010.05.014

[13] Wu Y. D., Cai Y. H., Chen X. H., Wang T., Si J. J., Wang L., Hui X. D. Phase composition and solid solution strengthening effect in TiZrNbMoV high-entropy alloys. Materials & Design. 2015, 83: 651-660.

DOI: https://doi.org/10.1016/j.matdes.2015.06.072

[14] Yang, X., Zhang, Y., Liaw, P. K. Microstructure and compressive properties of NbTiVTaAlx high entropy alloys. Procedia Engineering. 2012, 36: 292-298.

DOI: https://doi.org/10.1016/j.proeng.2012.03.043

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