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Peculiarities of deformation of CoCrFeMnNi at cryogenic temperatures

Published online by Cambridge University Press:  27 July 2018

Aditya Srinivasan Tirunilai ,
Jan Sas ,
Klaus-Peter Weiss ,
Hans Chen ,
Dorothée Vinga Szabó ,
Sabine Schlabach ,
Sebastian Haas ,
David Geissler ,
Jens Freudenberger  and
Martin Heilmaier
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Aditya Srinivasan Tirunilai
Affiliation:
Institute for Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe D-76131, Germany
Jan Sas
Affiliation:
Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany
Klaus-Peter Weiss
Affiliation:
Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany
Hans Chen
Affiliation:
Institute for Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe D-76131, Germany
Dorothée Vinga Szabó
Affiliation:
Institute for Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe D-76131, Germany; and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany
Sabine Schlabach
Affiliation:
Institute for Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe D-76131, Germany; and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany
Sebastian Haas
Affiliation:
Metals and Alloys, University Bayreuth, Bayreuth D-95447, Germany
David Geissler
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Complex Materials, Dresden D-01069, Germany
Jens Freudenberger
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials, Dresden D-01069, Germany; and Institute of Materials Science, Technische Universität Bergakademie Freiberg, Freiberg 09599, Germany
Martin Heilmaier
Affiliation:
Institute for Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe D-76131, Germany
Alexander Kauffmann*
Affiliation:
Institute for Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe D-76131, Germany
*
a)Address all correspondence to this author. e-mail: alexander.kauffmann@kit.edu
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Abstract

This contribution presents a comprehensive analysis of the low temperature deformation behavior of CoCrFeMnNi on the basis of quasistatic tensile tests at temperatures ranging from room temperature down to 4.2 K. Different deformation phenomena occur in the high-entropy alloy in this temperature range. These include (i) serrated plastic flow at certain cryogenic temperatures (4.2 K/8 K), (ii) deformation twinning (4.2 K/8 and 77 K), and (iii) dislocation slip (active from 4.2 K up to room temperature). The importance of deformation twinning for a stable work-hardening rate over an extended stress range as well as strain range has been addressed through the use of comprehensive orientation imaging microscopy studies. The proposed appearance of ε-martensite as well as a previously uninvestigated route of analysis, essentially a quantitative time-dependent, strain-dependent, and stress-dependent evaluation of the serrated plastic flow in CoCrFeMnNi is provided.

Keywords

alloydeformationmicrostructurehigh-entropy alloysplasticitycryogenic temperaturesserrations
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3287 - 3300
Copyright
Copyright © Materials Research Society 2018 

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