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

Published online by Cambridge University Press:  17 July 2018

Vishal Soni ,
Bharat Gwalani ,
Oleg N. Senkov ,
Babu Viswanathan ,
Talukder Alam ,
Daniel B. Miracle  and
Rajarshi Banerjee
Vishal Soni
Affiliation:
Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, Texas 76207, USA; and Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207, USA
Bharat Gwalani
Affiliation:
Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, Texas 76207, USA; and Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207, USA
Oleg N. Senkov
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA; and Materials and Processes Division, UES Inc., Beavercreek, Ohio 45432, USA
Babu Viswanathan
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA; and Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 4310, USA
Talukder Alam
Affiliation:
Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, Texas 76207, USA; and Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207, USA
Daniel B. Miracle
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
Rajarshi Banerjee*
Affiliation:
Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, Texas 76207, USA; and Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207, USA
*
a)Address all correspondence to this author. e-mail: Raj.Banerjee@unt.edu
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Abstract

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.

Keywords

alloyannealingmicrostructurephase equilibria

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Type
Article
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Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3235 - 3246
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

These authors contributed equally to this work.

c)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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