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Interfacial Microstructure Evolution Due to Strain Path Changes in Sliding Contacts.

Stefan J Eder1,2, Ulrike Cihak-Bayr1, Carsten Gachot1,2

  • 1AC2T research GmbH , Viktor-Kaplan-Straße 2/C , 2700 Wiener Neustadt , Austria.

ACS Applied Materials & Interfaces
|June 24, 2018
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Summary
This summary is machine-generated.

Molecular dynamics simulations reveal how sliding interfaces soften under changing strain paths. Microstructural changes recover upon reversing direction, crucial for wear resistance and energy efficiency in mechanical systems.

Keywords:
Bauschinger effectmicrostructure evolutionmolecular dynamicsstrain path change

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Area of Science:

  • Materials Science
  • Tribology
  • Computational Mechanics

Background:

  • Transient softening observed in sliding interfaces under strain path changes is critical for system efficiency and wear.
  • Applications include wind turbines, combustion engines, and heavy machinery.

Purpose of the Study:

  • Investigate the transient softening phenomenon using large-scale molecular dynamics (MD) simulations.
  • Analyze microstructural evolution in polycrystalline copper (fcc) and iron (bcc) under varying sliding conditions.

Main Methods:

  • Modeled sliding of a rough counterbody against fcc Cu and bcc Fe substrates (40 nm grain size).
  • Simulated unidirectional sliding (7 ns) and reversed sliding (5 ns + 2 ns).
  • Quantified microstructural changes (dislocations, grain refinement, rotation, twinning) as a function of time, depth, and pressure.

Main Results:

  • Observed generation of partial dislocations, grain refinement, rotation, and twinning in the near-surface region.
  • Microstructures evolved significantly with sustained sliding but largely recovered upon direction reversal.
  • Recovery occurred up to 0.4 GPa for fcc Cu and 1.5 GPa for bcc Fe.

Conclusions:

  • Sliding direction reversal can mitigate microstructural damage and induce recovery in sliding interfaces.
  • The MD model shows potential for studying bulk phenomena like the Bauschinger effect at interfaces.
  • Findings are relevant for designing more durable and energy-efficient mechanical components.