Effect of prolonged aging on phase evolution and mechanical properties of intermetallic strengthened CoCrFeNi2.1Nbx high entropy alloys

Sunkari, Upender and Reddy, S R and Chatterjee, Subhradeep and Bhattacharjee, Pinaki Prasad (2019) Effect of prolonged aging on phase evolution and mechanical properties of intermetallic strengthened CoCrFeNi2.1Nbx high entropy alloys. Materials Letters, 248. pp. 119-122. ISSN 0167-577X

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Abstract

Microstructure and tensile behavior of CoCrFeNi2.1Nbx (x = 0.2, 0.4) high entropy alloys were investigated in the as-cast and aged (800 °C/24 h) conditions. Increasing Nb addition increased strength but reduced ductility due to the increased volume fraction of Laves phase. On aging, fine acicular precipitates formed throughout the matrix in the CoCrFeNi2.1Nb0.4 alloy, but only at the dendrite boundaries in the CoCrFeNi2.1Nb0.2 alloy. While both the aged alloys showed increase in strength due to the presence of the fine precipitates, the favorable microstructure of the CoCrFeNi2.1Nb0.2 ensured a larger mean free path for gliding dislocations, thus rendering superior strength-ductility synergy.

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IITH Creators:
IITH CreatorsORCiD
Bhattacharjee, Pinaki Prasadhttp://orcid.org/0000-0002-6422-2601
Chatterjee, Subhradeephttp://orcid.org/0000-0002-4686-6593
Item Type: Article
Uncontrolled Keywords: High entropy alloys, Microstructure, Phase transformation, Mechanical properties
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 10 Apr 2019 11:57
Last Modified: 10 Apr 2019 11:57
URI: http://raiith.iith.ac.in/id/eprint/4946
Publisher URL: http://doi.org/10.1016/j.matlet.2019.04.012
OA policy: http://sherpa.mimas.ac.uk/romeo/issn/0167-577X/
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