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Mechanism of high-pressure torsion-induced shear banding and lamellar thickness saturation in Co–Cr–Fe–Ni–Nb high-entropy composites

Published online by Cambridge University Press:  14 May 2019

Tapabrata Maity ,
Konda Gokuldoss Prashanth ,
Alexander Janda ,
Jeong Tae Kim ,
Florian Spieckermann  and
Jürgen Eckert
Tapabrata Maity
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria; and Department Materials Physics, Montanuniversitat Leoben, Leoben 8700, Austria
Konda Gokuldoss Prashanth*
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria; and Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn 19086, Estonia
Alexander Janda
Affiliation:
Department Materials Physics, Montanuniversitat Leoben, Leoben 8700, Austria
Jeong Tae Kim
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
Florian Spieckermann
Affiliation:
Department Materials Physics, Montanuniversitat Leoben, Leoben 8700, Austria
Jürgen Eckert
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria; and Department Materials Physics, Montanuniversitat Leoben, Leoben 8700, Austria
*
a)Address all correspondence to this author. e-mail: kgprashanth@gmail.com
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Abstract

High-entropy composites (HECs) were subjected to severe straining by high-pressure torsion (HPT) to evaluate their influence on the evolution of microstructure and deformation behavior. Severe straining leads to a homogeneously strained microstructure and inhomogeneous micro-shear bands in these HECs. Nb addition in HECs varies the microstructure from single phase to eutectic, and the Vickers microhardness in HPT HECs increases to 7.45 GPa. Nb addition up to x = 0.80 in as-cast HECs improves the strength of these materials at the expense of its plasticity. Nevertheless, severe straining provides a better combination of strength and ductility without sacrificing its plasticity. Such improvement in properties is attributed to the evolved microstructural features, formation of “transformation-shear bands (T-SBs)” and “deformation-shear bands (D-SBs)” at severe straining. This assures the homogeneous deformation by shear banding and suggests that shear banding is the dominant deformation mechanism when the lamellar spacing becomes saturated upon severe straining.

Keywords

high-pressure torsionultrafine eutecticmicro-indentationsevere plastic deformationshear bands
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 15 , 14 August 2019 , pp. 2672 - 2682
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Copyright © Materials Research Society 2019 

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Footnotes

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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