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9 results

  • Phase stability as a function of temperature in a refractory high-entropy alloy

  • Vishal Soni, Bharat Gwalani, Oleg N. Senkov, Babu Viswanathan, Talukder Alam, Daniel B. Miracle, Rajarshi Banerjee
  • Journal:
    Journal of Materials Research / Volume 33 / Issue 19 / 14 October 2018
    Published online by Cambridge University Press:
    17 July 2018, pp. 3235-3246
    Print publication:
    14 October 2018

  • Refractory high-entropy alloys (RHEAs) have recently attracted much attention, primarily due to their mechanical properties at elevated temperatures. However, the equilibrium phase-stability of these alloy systems is not well established. The present investigation focuses on the phase stability of Al0.5NbTa0.8Ti1.5V0.2Zr RHEA at temperatures ranging from 600 to 1200 °C. The detailed phase characterization involves coupling of scanning electron microscopy, transmission electron microscopy, and atom probe tomography. The stable phases present at these temperatures are (i) 1200 °C—body-centered cubic (BCC) matrix with nano-B2 precipitates; (ii) 1000 °C and 800 °C—a BCC matrix phase with Al–Zr rich hexagonal closed packed intermetallic precipitates and, (iii) 600 °C—a BCC + B2 microstructure, comprising a continuous BCC matrix with discrete B2 precipitates. These results highlight the substantial changes in phase stability as a function of temperature in RHEAs, and high-entropy alloys in general, and also the importance of accounting for these changes especially while designing alloys for high temperature applications.