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

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. Furthermore, this is rationalized by a reduction of the deformation controlling internal length scale by precipitate formation in conjunction with a diffusional contribution.

Authors:
 [1];  [2];  [3];  [4];  [1];  [2]
  1. Montanuniversitat Leoben, Leoben (Austria)
  2. Austrian Academy of Sciences, Leoben (Austria)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1376416
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 32; Journal Issue: 14; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Maier-Kiener, Verena, Schuh, Benjamin, George, Easo P., Univ. of Tennessee, Knoxville, TN, Clemens, Helmut, and Hohenwarter, Anton. Insights into the deformation behavior of the CrMnFeCoNi high-entropy alloy revealed by elevated temperature nanoindentation. United States: N. p., 2017. Web. doi:10.1557/jmr.2017.260.
Maier-Kiener, Verena, Schuh, Benjamin, George, Easo P., Univ. of Tennessee, Knoxville, TN, Clemens, Helmut, & Hohenwarter, Anton. Insights into the deformation behavior of the CrMnFeCoNi high-entropy alloy revealed by elevated temperature nanoindentation. United States. doi:10.1557/jmr.2017.260.
Maier-Kiener, Verena, Schuh, Benjamin, George, Easo P., Univ. of Tennessee, Knoxville, TN, Clemens, Helmut, and Hohenwarter, Anton. Thu . "Insights into the deformation behavior of the CrMnFeCoNi high-entropy alloy revealed by elevated temperature nanoindentation". United States. doi:10.1557/jmr.2017.260. https://www.osti.gov/servlets/purl/1376416.
@article{osti_1376416,
title = {Insights into the deformation behavior of the CrMnFeCoNi high-entropy alloy revealed by elevated temperature nanoindentation},
author = {Maier-Kiener, Verena and Schuh, Benjamin and George, Easo P. and Univ. of Tennessee, Knoxville, TN and Clemens, Helmut and Hohenwarter, Anton},
abstractNote = {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. Furthermore, this is rationalized by a reduction of the deformation controlling internal length scale by precipitate formation in conjunction with a diffusional contribution.},
doi = {10.1557/jmr.2017.260},
journal = {Journal of Materials Research},
number = 14,
volume = 32,
place = {United States},
year = {2017},
month = {7}
}

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Works referenced in this record:

Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes
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