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Hot deformation behavior of the high-entropy alloy CoCuFeMnNi

Published online by Cambridge University Press:  21 February 2019

Natasha Prasad ,
Nitish Bibhanshu ,
Niraj Nayan ,
Ganesh S. Avadhani  and
Satyam Suwas
Natasha Prasad
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
Nitish Bibhanshu
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
Niraj Nayan*
Affiliation:
Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthpuram-695022, India
Ganesh S. Avadhani
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
Satyam Suwas
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In the present study, hot deformation behavior of a FCC high-entropy alloy CoCuFeMnNi has been investigated to explore the stress–strain response for a wide range of temperatures and strain rates. The deformation response has been examined by plotting a processing map and examining the evolution of microstructure and texture in each of the temperature–strain rate domain. Hot compression tests were carried out in the temperature range 850–1050 °C at strain rates varying from 0.001 s−1 to 10 s−1. Stress–strain curves indicate characteristic softening behavior due to dynamic recrystallization (DRX). DRX has been observed along grain boundaries, shear bands, as well as in the interior of deformed grains. The size of dynamically recrystallized grains shows a strong dependence on deformation temperature and increases with temperature. A high degree of twin formation takes place in the DRX grains evolved inside the shear bands, and the extent of twinning decreases at high temperatures. The optimal processing window has been estimated based on strain rate sensitivity and has been validated with detailed analyses of microstructure and texture. The best region for thermo-mechanical processing has been identified as in the temperature range 850–950 °C at strain rate 10−1 s−1.

Keywords

high-entropy alloydeformation behaviorstrain rate sensitivity mapmicrostructuretexturedynamic recrystallization
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. 744 - 755
Copyright
Copyright © Materials Research Society 2019 

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