INDENTATION SIZE EFFECT IN HIGH PRESSURE TORSION PROCESSED HIGH ENTROPY ALLOY

Authors

  • Petr Haušild Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Praha, Czech Republic
  • Jakub Čížek Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holešovickách 2, Praha 8, CZ-18000, Czech Republic
  • Jaroslav Čech Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Praha, Czech Republic
  • Jiří Zýka UJP PRAHA a.s., Nad Kamínkou 1345, 156 00, Praha, Czech Republic
  • Hyoung Seop Kim POSTECH, Department of Materials Science and Engineering, Pohang, 790-784, South Korea

DOI:

https://doi.org/10.14311/APP.2020.27.0141

Keywords:

High entropy alloys, high pressure torsion, indentation size effect, nanoindentation

Abstract

High entropy alloy HfNbTaTiZr in as cast conditions and after high pressure torsion straining was characterized by nanoindentation. The length-scale dependent material response (indentation size effect) was characterized by indentation at various indentation depths. Hardness dependence on the characteristic length (depth of penetration) indicated decomposition of disordered high entropy alloy in the as cast sample, which probably occurred during slow cooling after casting. Subsequent severe plastic deformation by high pressure torsion led on the other hand to the short-range disorder of (originally partially decomposed as cast) structure. Further hardening was generated during high pressure torsion by the mechanisms of grain refinement and increasing dislocation density.

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Published

2020-06-11

Issue

Vol. 27 (2020): Proceedings of the 14th International Conference on Local Mechanical Properties - LMP 2019

Section

Articles

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