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Development and homogeneity of microstructure and texture in a lamellar AlCoCrFeNi2.1 eutectic high-entropy alloy severely strained in the warm-deformation regime

Published online by Cambridge University Press:  01 February 2019

Seelam Rajasekhar Reddy ,
Upender Sunkari ,
Adrianna Lozinko ,
Sheng Guo  and
Pinaki Prasad Bhattacharjee
Seelam Rajasekhar Reddy
Affiliation:
Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, Telangana 502285, India
Upender Sunkari
Affiliation:
Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, Telangana 502285, India
Adrianna Lozinko
Affiliation:
Industrial and Materials Science, Chalmers University of Technology, Gothenburg 41296, Sweden
Sheng Guo
Affiliation:
Industrial and Materials Science, Chalmers University of Technology, Gothenburg 41296, Sweden
Pinaki Prasad Bhattacharjee*
Affiliation:
Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, Telangana 502285, India
*
a)Address all correspondence to this author. e-mail: pinakib@iith.ac.in
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Abstract

The effect of severe warm rolling on microstructure and texture homogeneities was investigated in a lamellar (L12 + B2) AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA). The EHEA 90% warm-rolled at 400 °C showed disordering of the L12 phase and a remarkable increase in hardness. A much finer microstructure was observed on ND-RD (Normal Direction-Rolling Direction) plane as compared with that on the RD-TD (Rolling Direction-Transverse Direction) plane. The L12/Face Centered Cubic (FCC) phase developed α-fiber texture ND//〈110〉 with a particularly strong brass ({110}〈112〉) component, while the B2 phase developed the usual RD (//〈110〉) and ND (//〈111〉) fibers. Nevertheless, inhomogeneities in texture were noticed. Upon annealing at 800 °C, the ND-RD showed an ultrafine microduplex structure, while the RD-TD showed a retained lamellar structure. A rather uniform microduplex structure evolved after annealing at 1200 °C due to the accelerated kinetics of transformation at higher temperatures. The L12/FCC phase showed the retention of the α-fiber components, while the B2 phase showed stronger ND-fiber after annealing, although inhomogeneities in texture existed.

Keywords

high-entropy alloyswarm rollingannealingmicrostructuretexturehardness
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 5: Focus Issue: Nanocrystalline High Entropy Materials: Processing Challenges and Properties , 14 March 2019 , pp. 687 - 699
Copyright
Copyright © Materials Research Society 2019 

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