Microstructure and unusually strong recrystallization texture of the FCC phase of a cost-effective high-strength dual-phase AlCrFe2Ni2 high entropy alloy

Tripathy, B. and Saha, R. and Bhattacharjee, Pinaki Prasad (2022) Microstructure and unusually strong recrystallization texture of the FCC phase of a cost-effective high-strength dual-phase AlCrFe2Ni2 high entropy alloy. Intermetallics, 145. pp. 1-12. ISSN 0966-9795

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Abstract

The evolution of microstructure and recrystallization texture was investigated in a severely deformed (90% cold-rolled) and annealed (FCC + BCC/B2) AlCrFe2Ni2 high entropy alloy (HEA) with an exclusive focus on the FCC phase. Cold-rolling resulted in pronounced bending and folding of the lamellae, progressive alignment of the phases along the RD, large misorientation gradient in the FCC phase, and finally ultrafine structure formation. The FCC phase showed a predominantly brass-type (B) texture with orientations spreading from the G ({011}<100>) to B ({011}<112>), indicating its low stacking fault energy (SFE). The prior cold-rolling deformation strongly influenced the annealing behavior, including lamellar to microduplex structure, grain boundary character evolution, and faster attainment of equilibrium phase fractions. The 90% cold-rolled and annealed material revealed the presence of a remarkably strong B component, unlike the weak recrystallization texture of typical FCC single-phase low SFE HEAs. The origin of the strong B recrystallization component was attributed to a combined effect of the high misorientation gradient in the FCC phase, increased boundary mobility at high annealing temperatures, and the presence of the BCC/B2 phase inhibiting grain growth and thus preserving the recrystallized B grains. The tensile properties of the HEA were evaluated to highlight the outstanding cost-performance advantage of the alloy. Â© 2022 Elsevier Ltd

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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 financial supports of DST-SERB, India (CRG/2020/00665; STR/ 2021/000044), the DST-FIST program (SR/FST/ETI-421/2016), and the DRDO (ER&IPR) (ERIP/ER/2002002/M/01/1773) are sincerely acknowledged. The authors sincerely acknowledge the help and support of Dr. Vajinder Singh and Dr. Partha Ghosal (DMRL, Hyderabad) for the PED experiments

Uncontrolled Keywords:

Annealing, Cold-rolling, High entropy alloys, Mechanical properties, Microstructure, Texture

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

24 Jun 2022 05:21

Last Modified:

27 Jul 2022 06:07