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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 1/2014

01-01-2014 | Symposium: High Entropy Alloys

Age Hardening of the Al0.5CoCrNiTi0.5 High-Entropy Alloy

Authors: Che-Fu Lee, Tao-Tsung Shun

Published in: Metallurgical and Materials Transactions A | Issue 1/2014

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Abstract

Al0.5CoCrNiTi0.5 high-entropy alloy was synthesized by vacuum arc melting in a copper mold. This alloy was aged at 773 K to 1473 K (500 °C to 1200 °C) for 24 hours to investigate the microstructure and hardness. The hardness of the as-cast alloy is HV743, and it exhibits a dendritic structure, in which dendrite is composed of body-centered cubic (bcc), face-centered cubic (fcc), and σ phases, and interdendrite is an eutectic structure consisting of bcc and order bcc phases. Apparent age hardening appears at 873 K to 1173 K (600 °C to 900 °C), and no age softening occurs even after 1473 K (1200 °C) aging. The age hardening of this alloy is attributed to the transformation of the bcc phase to σ phase. Detailed variations of hardness and the microstructure of aged alloys are reported in this article.
previous article On the Solidification and Phase Stability of a Co-Cr-Fe-Ni-Ti High-Entropy Alloy
next article Hybrid Monte Carlo/Molecular Dynamics Simulation of a Refractory Metal High Entropy Alloy

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Metadata
Title
Age Hardening of the Al0.5CoCrNiTi0.5 High-Entropy Alloy
Authors
Che-Fu Lee
Tao-Tsung Shun
Publication date
01-01-2014
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 1/2014
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-013-1931-4

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