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Insights into the deformation behavior of the CrMnFeCoNi high-entropy alloy revealed by elevated temperature nanoindentation

Published online by Cambridge University Press:  27 July 2017

Verena Maier-Kiener ,
Benjamin Schuh ,
Easo P. George ,
Helmut Clemens  and
Anton Hohenwarter
Verena Maier-Kiener*
Affiliation:
Department Physical Metallurgy & Materials Testing, Montanuniversität Leoben, Leoben A-8700, Austria
Benjamin Schuh
Affiliation:
Department Materials Physics, Montanuniversität Leoben & Erich-Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben A-8700, Austria
Easo P. George
Affiliation:
Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, Tennessee 37831-6115, USA; and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-2100, USA
Helmut Clemens
Affiliation:
Department Physical Metallurgy & Materials Testing, Montanuniversität Leoben, Leoben A-8700, Austria
Anton Hohenwarter
Affiliation:
Department Materials Physics, Montanuniversität Leoben & Erich-Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben A-8700, Austria
*
a) Address all correspondence to this author. e-mail: verena.maier-kiener@unileoben.ac.at
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Abstract

A CrMnFeCoNi high-entropy alloy was investigated by nanoindentation from room temperature to 400 °C in the nanocrystalline state and cast plus homogenized coarse-grained state. In the latter case a 〈100〉-orientated grain was selected by electron back scatter diffraction for nanoindentation. It was found that hardness decreases more strongly with increasing temperature than Young’s modulus, especially for the coarse-grained state. The modulus of the nanocrystalline state was slightly higher than that of the coarse-grained one. For the coarse-grained sample a strong thermally activated deformation behavior was found up to 100–150 °C, followed by a diminishing thermally activated contribution at higher testing temperatures. For the nanocrystalline state, different temperature dependent deformation mechanisms are proposed. At low temperatures, the governing processes appear to be similar to those in the coarse-grained sample, but with increasing temperature, dislocation-grain boundary interactions likely become more dominant. Finally, at 400 °C, decomposition of the nanocrystalline alloy causes a further reduction in thermal activation. This is rationalized by a reduction of the deformation controlling internal length scale by precipitate formation in conjunction with a diffusional contribution.

Keywords

high entropy alloynanoindentationstrain rate sensitivityelevated temperaturedeformation processes
Type
Invited Papers
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2658 - 2667
Copyright
Copyright © Materials Research Society 2017. This is a work of the U.S. Government and is not subject to copyright protection in the United States. 

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Footnotes

Contributing Editor: Mathias Göken

References

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