Micro- and mesoscale mechanical properties of an ultra-fine grained CrFeMnNi high entropy alloy produced by large strain machining

Gigax J. G., El-Atwani O., McCulloch Q., Aytuna B., EFE M., Fensin S., ...More

SCRIPTA MATERIALIA, vol.178, pp.508-512, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 178
  • Publication Date: 2020
  • Doi Number: 10.1016/j.scriptamat.2019.11.042
  • Journal Name: SCRIPTA MATERIALIA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.508-512
  • Keywords: Large strain machining (LSM), Severe plastic deformation, High entropy alloys, HIGH-PRESSURE TORSION, DEFORMATION, MICROSTRUCTURE, STABILITY
  • Middle East Technical University Affiliated: Yes

Abstract

Large strain machining (LSM), an attractive severe deformation technique due to its simplicity, has been previously used to produce a fine-grained structure in a variety of alloys. An equiatomic CrFeMnNi high entropy alloy was subject to various LSM conditions. The microstructure was observed to have ultra-fine grains in all conditions, with some more homogeneous than others. Nanoindentation showed a considerable increase in hardness for all LSM conditions with respect to the base material. Mesoscale tensile testing revealed that, while the tensile strength of the LSM specimens was higher than that of the base material, the ductility was reduced significantly. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.