Analysis of microstructure and microtexture during grain growth in low stacking fault energy equiatomic CoCrFeMnNi high entropy and Ni–60 wt.%Co alloys

Sathiaraj, G D and Bhattacharjee, Pinaki Prasad (2015) Analysis of microstructure and microtexture during grain growth in low stacking fault energy equiatomic CoCrFeMnNi high entropy and Ni–60 wt.%Co alloys. Journal of Alloys and Compounds, 637. pp. 267-276. ISSN 0925-8388

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Abstract

The evolution of microstructure, texture and fraction of annealing twin boundaries is studied in Ni–60 wt.%Co and equiatomic CoCrFeMnNi high entropy alloy (HEA) with similar low stacking fault energy (SFE). The two materials are cold-rolled to 90% reduction in thickness and subjected to different annealing treatments to achieve very similar average grain size. The twin boundary fraction in the two materials was found to be similar for the same average grain size. This indicated that twin boundary fraction depended on the final grain size. The two alloys revealed a strong brass type deformation texture typical of low SFE materials. However, the texture after grain growth in the two alloys was strikingly dissimilar. The Ni–Co alloy showed strong α-fiber (ND//〈1 1 0〉) components, namely, G ({1 1 0}〈0 1 1〉) and G/B ({1 1 0}〈1 1 5〉) due to the preferential growth of these components. In contrast, the microstructure of the HEA showed no preferential grain growth and texture components in HEA revealed only minor changes. These sharply different microstructure and texture formation mechanisms in the two alloys could be explained on the basis of sluggish diffusion in multicomponent HEA which greatly diminished grain boundary mobility and restricted preferential grain growth.

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IITH Creators:

IITH Creators	ORCiD
Bhattacharjee, Pinaki Prasad	http://orcid.org/0000-0002-6422-2601

Item Type:

Article

Additional Information:

The authors also acknowledge Professor J.W. Yeh, National Tsing Hua University, Taiwan for kindly providing the starting HEA used in the present research work.

Uncontrolled Keywords:

High entropy alloys; Grain growth; Microstructure; Texture; EBSD

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

Library Staff

Date Deposited:

13 Jan 2016 08:29

Last Modified:

31 Aug 2017 06:45