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Nanomechanical behavior and structural stability of a nanocrystalline CoCrFeNiMn high-entropy alloy processed by high-pressure torsion

Published online by Cambridge University Press:  18 August 2015

Dong-Hyun Lee
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea
In-Chul Choi
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea
Moo-Young Seok
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea
Junyang He
Affiliation:
State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 10083, People's Republic of China
Zhaoping Lu
Affiliation:
State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 10083, People's Republic of China
Jin-Yoo Suh
Affiliation:
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
Megumi Kawasaki
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea
Terence G. Langdon
Affiliation:
Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1453, USA; and Faculty of Engineering and the Environment, Materials Research Group, University of Southampton, Southampton SO17 1BJ, UK
Jae-il Jang
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea
Corresponding
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Abstract

A CoCrFeNiMn high-entropy alloy (HEA), in the form of a face-centered cubic (fcc) solid solution, was processed by high-pressure torsion (HPT) to produce a nanocrystalline (nc) HEA. Significant grain refinement was achieved from the very early stage of HPT through 1/4 turn and an nc structure with an average grain size of ∼40 nm was successfully attained after 2 turns. The feasibility of significant microstructural changes was attributed to the occurrence of accelerated atomic diffusivity under the torsional stress during HPT. Nanoindentation experiments showed that the hardness increased significantly in the nc HEA during HPT processing and this was associated with additional grain refinement. The estimated values of the strain-rate sensitivity were maintained reasonably constant from the as-cast condition to the nc alloy after HPT through 2 turns, thereby demonstrating a preservation of plasticity in the HEA. In addition, a calculation of the activation volume suggested that the grain boundaries play an important role in the plastic deformation of the nc HEA where the flow mechanism is consistent with other nc metals. Transmission electron microscopy showed that, unlike conventional fcc nc metals, the nc HEA exhibits excellent microstructural stability under severe stress conditions.

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Copyright © Materials Research Society 2015 

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Nanomechanical behavior and structural stability of a nanocrystalline CoCrFeNiMn high-entropy alloy processed by high-pressure torsion
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