Microstructure and texture of heavily cold-rolled and annealed extremely low stacking fault energy Cr26Mn20Fe20Co20Ni14 high entropy alloy: Comparative insights

Paul, S. and Tripathy, B. and Saha, R. and Bhattacharjee, Pinaki Prasad (2023) Microstructure and texture of heavily cold-rolled and annealed extremely low stacking fault energy Cr26Mn20Fe20Co20Ni14 high entropy alloy: Comparative insights. Journal of Alloys and Compounds, 930. pp. 1-12. ISSN 0925-8388

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Abstract

Microstructure and crystallographic texture of an extremely low stacking fault energy (SFE) FCC single-phase Cr26Mn20Fe20Co20Ni14 high entropy alloy (HEA) was investigated and compared with selected low SFE FCC HEAs. The Cr26Mn20Fe20Co20Ni14 HEA was 90% cold-rolled and annealed between 750 °C and 1200 °C. The microstructural evolution revealed nano-twins, extensive shear bands, and gradual evolution of deformation-induced lamellar nanostructure. Evidence of deformation-driven FCC→HCP transformation was indicated after heavy cold-rolling. Concomitant to microstructural evolution, the formation of a predominant brass-type ({110}[removed]) texture after heavy cold-rolling was confirmed. Annealing resulted in the formation of (Co, Cr) rich σ phase precipitates stable up to 1000 °C but dissolved in the FCC matrix at higher annealing temperatures. The pinning effect exerted by the precipitates resulted in considerable hindrance to grain growth compared to other FCC HEAs, whereas dissolution of the precipitates resulted in extensive grain growth. Annealing textures retained α-fiber (normal direction (ND)//< 001 > ) components and also showed a high volume of random components. These observations highlighted the limited contributions of preferential nucleation and growth. Broadly, the annealing texture showed remarkable resemblance with other low SFE HEAs. An appreciable strength-ductility balance could be observed in the suitably annealed HEA. Meanwhile, Hall-Petch analysis indicated a significantly lower lattice friction stress (∼53 MPa) compared to FCC equiatomic HEAs. © 2022 Elsevier B.V.

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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 acknowledge the financial support of DST-SERB , India ( STR/2021/000044 , CRG/2020/00665 ), the DST-FIST scheme ( SR/FST/ETI-421/2016 ), DRDO ( ERIP/ER/2002002/M/01/1773 ), and JICA ( FRIENDSHIP 2.0 ).

Uncontrolled Keywords:

Deformation; High entropy alloys; Mechanical properties; Recrystallization; Stacking fault energy; Texture

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

22 Oct 2022 05:03

Last Modified:

22 Oct 2022 05:03