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When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
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Updated: Dec 17, 2025

Determining Tribocorrosion Rate and Wear-Corrosion Synergy of Bulk and Thin Film Aluminum Alloys
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Microstructural changes in CoCrFeMnNi under mild tribological load.

Antje Dollmann1,2, Alexander Kauffmann1, Martin Heilmaier1

  • 1Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany.

Journal of Materials Science
|June 30, 2020
PubMed
Summary
This summary is machine-generated.

High-entropy alloys (HEAs) exhibit unique deformation behaviors under tribological loading. This study reveals a thick nanocrystalline subsurface layer formed rapidly in CoCrFeMnNi, driven by twinning and dislocation activity, offering insights for future alloy design.

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Area of Science:

  • Materials Science
  • Tribology
  • Metallurgy

Background:

  • High-entropy alloys (HEAs) possess unique properties due to their complex compositions.
  • Tribological loading induces dynamic microstructural changes in metallic materials.
  • HEAs offer potential for enhanced solid solution strengthening, possibly mitigating microstructural evolution.

Purpose of the Study:

  • To experimentally investigate the subsurface deformation behavior of CoCrFeMnNi under dry, reciprocating tribological contact.
  • To analyze the microstructural evolution, including grain refinement and twinning, during tribological loading.
  • To understand the role of dislocation activity and oxide formation in the wear mechanisms of HEAs.

Main Methods:

  • Reciprocating tribological testing of CoCrFeMnNi under a mild normal load.
  • Microstructural characterization of the subsurface deformation layer using advanced microscopy techniques.
  • Analysis of twinning mechanisms and dislocation motion within the stressed material.

Main Results:

  • A surprisingly thick subsurface deformation layer formed after a single tribological stroke.
  • The deformation layer was characterized by nanocrystalline grains, extensive twinning, and localized dislocation motion.
  • Twinning was identified as a critical factor in the layer's thickness, with grain rotation and fragmentation observed.
  • Oxide-rich layers formed after multiple cycles, intermixing with the nanocrystalline structure due to material transfer.

Conclusions:

  • The study elucidates the fundamental mechanisms governing subsurface deformation in CoCrFeMnNi under tribological load.
  • Twinning and dislocation dynamics play crucial roles in forming a nanocrystalline layer.
  • The findings provide a basis for designing HEAs with tailored properties for tribological applications.