Development of Impressive Tensile Properties of Hybrid Rolled Ta0.5Nb0.5Hf0.5ZrTi1.5 Refractory High Entropy Alloy
The microstructure, texture, phase stability, and tensile properties of annealed Ta0.5Nb0.5Hf0.5ZrTi1.5 alloy have been investigated in the present research. The alloy was severely hybrid-rolled up to 93.5% thickness reduction, subsequently rolled samples subjected to an annealing treatment at 800 °C and 1000 °C temperatures for 1 h. Consequently, the rolled condition and both annealed temperatures have a body-centered cubic (BCC) structure. Furthermore, quantitative texture measurements (orientation distribution function (ODF) analysis) and microstructural examinations (analytical electron backscatter diffraction (EBSD) maps) permitted to establish a good relationship between annealing texture and microstructure and universal testing machine (UTM) utilized for obtaining the mechanical properties. Impressive room temperature tensile properties combination with the tensile strength (1380 MPa) and (24.7%) elongation is achieved for the 800 °C heat-treated condition. The evolution of the coarse microstructure featured in the case of 1000 °C annealed temperature ascribed to the influence of high thermal energy.
 Yeh, J. W., Chen, S. K., Lin, S. J., Gan, J. Y., Chin, T. S., Shun, T. T., ... & Chang, S. Y. (2004). Nanostructured high‐entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Advanced Engineering Materials, 6(5), 299-303.
 Murty, Bhagevatula Satyanarayana, Jien-Wei Yeh, Srinivasa Ranganathan, and P. P. Bhattacharjee. High- entropy alloys. Elsevier, 2019.
 Senkov, O. N., Wilks, G. B., Scott, J. M., & Miracle, D. B. (2011). Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys. Intermetallics, 19(5), 698-706.
 Sheikh, S., Shafeie, S., Hu, Q., Ahlström, J., Persson, C., Veselý, J., ... & Guo, S. (2016). Alloy design for intrinsically ductile refractory high-entropy alloys. Journal of Applied Physics, 120(16), 164902.
 Humphreys, F.J. and M. Hatherly, in Recrystallization and Related Annealing Phenomena (Second Edition). 2004, Elsevier: Oxford.
 Verlinden, B., Driver, J., Samajdar, I., & Doherty, R. D. (2007). Thermo-mechanical processing of metallic materials (Vol. 11). Elsevier.
 Raabe, Dierk, and K. Lücke. "Rolling and annealing textures of bcc metals." In Materials Science Forum, vol. 157, pp. 597-610. Trans Tech Publications Ltd, 1994.
 Favier, Denis, Hervé Louche, Pauline Schlosser, Laurent Orgéas, Pierre Vacher, and Laurent Debove. "Homogeneous and heterogeneous deformation mechanisms in an austenitic polycrystalline Ti–50.8 at.% Ni thin tube under tension. Investigation via temperature and strain fields measurements." Acta Materialia 55, no. 16 (2007): 5310-5322.
 Stouffer, Donald C., and L. Thomas Dame. Inelastic deformation of metals: models, mechanical properties, and metallurgy. John Wiley & Sons, 1996.