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Ageing behaviour of equiatomic consolidated Al20Co20Cu20Ni20Zn20 high entropy alloy

Mohanty, S and Gurao, N P and Padaikathan, P and Biswas, Krishanu (2017) Ageing behaviour of equiatomic consolidated Al20Co20Cu20Ni20Zn20 high entropy alloy. In: MATERIALS CHARACTERIZATION, 129 . pp. 127-134.

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Official URL: https://doi.org/10.1016/j.matchar.2017.04.011

Abstract

The effect of ageing treatment on the evolution of microstructure and hardness of consolidated Al20Co20Cu20Ni20Zn20 high entropy alloy is reported. The consolidated alloy specimens were solutionized by heat treatment at 1433 K for 96 h. The solutionized specimens were subsequently subjected to ageing treatment at 673, 773, 873 and 1073 K for 48 h to investigate the effect of ageing treatment on the evolution of microstructure as well as micro-hardness of the alloy. The fully solutionized specimens reveal formation of single phase FCC beta phase. The artificially aged alloy consists of Ni and Al rich FCC a (Ll(2)) precipitate in FCC (gamma) matrix. This is akin to precipitation in Ni-based superalloys. The hardness measurement of the aged specimens indicate peak age-hardening (similar to 6.2 GPa) at 773 K. Therefore, the present study demonstrates possibility of age hardening of consolidated alloys akin to sinter ageing.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 14 Jul 2017 04:38
Last Modified: 14 Jul 2017 04:38
URI: http://eprints.iisc.ac.in/id/eprint/57366

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