Phase transformations of HfNbTaTiZr high-entropy alloy at intermediate temperatures

By Shuying Chen, Yang Tong, K. Tseng, Jien‐Wei Yeh, J. Poplawsky, J. Wen, Michael C. Gao, George Kim, Wei Chen, Yang Ren and 3 more. Scripta Materialia, 2019

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Abstract The strong and ductile single-phase body-centered-cubic (BCC) HfNbTaTiZr refractory high-entropy alloy (RHEA) is a potential structural material for high-temperature applications. However, the BCC phase stability in the intermediate temperature range (500–900 °C) needs to be better understood to make this alloy applicable to industry. In the present work, the phase decomposition of the HfNbTaTiZr RHEA is examined at different temperatures (500–1000 °C). Additionally, the formation of BCC Ta-Nb-rich and hexagonal-close-packed (HCP) Hf-Zr-rich precipitates are studied as a function of annealing time at 700 °C using a combination of atom probe tomography, transmission electron microscopy, and X-ray diffraction. We found that these BCC and HCP precipitates have preferred orientations with the BCC matrix.

Subfields: Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/d452d5ea41c5cc85c2b750af55453031f291b7f1