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Title: Nanoindentation testing as a powerful screening tool for assessing phase stability of nanocrystalline high-entropy alloys

The equiatomic high-entropy alloy (HEA), CrMnFeCoNi, has recently been shown to be microstructurally unstable, resulting in a multi-phase microstructure after intermediate-temperature annealing treatments. The decomposition occurs rapidly in the nanocrystalline (NC) state and after longer annealing times in coarse-grained states. To characterize the mechanical properties of differently annealed NC states containing multiple phases, nanoindentation was used in this paper. The results revealed besides drastic changes in hardness, also for the first time significant changes in the Young's modulus and strain rate sensitivity. Finally, nanoindentation of NC HEAs is, therefore, a useful complementary screening tool with high potential as a high throughput approach to detect phase decomposition, which can also be used to qualitatively predict the long-term stability of single-phase HEAs.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [2]
  1. Montanuniversitat Leoben (Austria). Dept. of Physical Metallurgy and Materials Testing
  2. Montanuniversitat Leoben (Austria). Dept. of Materials Physics; Austrian Academy of Sciences, Leoben (Austria). Erich-Schmid-Inst. of Materials Science
  3. Ruhr Univ., Bochum (Germany). Inst. for Materials
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 340185; P26729-N19; 837900; GE 2736/1-1
Type:
Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 115; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Research Org:
Montanuniversitat Leoben (Austria); Austrian Academy of Sciences, Leoben (Austria); Ruhr Univ., Bochum (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Research Council (ERC); Austrian Science Fund (FWF); Austrian Federal Government; German Research Foundation (DFG)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nanoindentation; High-entropy alloys; Severe plastic deformation; High-pressure torsion; Phase stability; Nanocrystalline
OSTI Identifier:
1376452
Alternate Identifier(s):
OSTI ID: 1414489