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A comparative study on the evolution of microstructure and hardness during monotonic and cyclic high pressure torsion of CoCuFeMnNi high entropy alloy

Published online by Cambridge University Press:  06 February 2019

Reshma Sonkusare ,
Nimish Khandelwal ,
Pradipta Ghosh ,
Krishanu Biswas  and
Nilesh Prakash Gurao Open the ORCID record for Nilesh Prakash Gurao [Opens in a new window]
Reshma Sonkusare
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
Nimish Khandelwal
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India; and Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur 302017, India
Pradipta Ghosh
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
Krishanu Biswas
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
Nilesh Prakash Gurao*
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Discs of CoCuFeMnNi face centered cubic high entropy alloy were subjected to monotonic and cyclic high pressure torsion (HPT) in a single step and multiple steps of 5° forward and reverse cycle for 100° and 360° twist, respectively, under 5 GPa pressure at room temperature. It was observed that the 100° cyclic HPT sample shows the highest hardness at the periphery comparable to 360° monotonic HPT sample, while the cyclic 360° HPT sample shows the lowest hardness throughout the sample. High hardness of 100° cyclic HPT sample can be attributed to finer grain size and unstable dislocation substructure by continuous change in strain path from initial compression to forward–reverse torsion, while stable dislocation structure corresponding to shear contributes to increase in hardness from 100° to 360° for monotonic HPT sample. The unstable dislocation substructure promotes grain boundary migration–enabled grain growth leading to low hardness throughout the 360° cyclic HPT sample.

Keywords

dislocationsgrain sizehardness
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. 732 - 743
Copyright
Copyright © Materials Research Society 2019 

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