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Area of Science:

  • Materials Science
  • Solid-state Physics
  • Surface Science

Background:

  • Multiphase microstructures are fundamental to engineering materials.
  • Heterophase interfaces often contain mismatch dislocations that influence material properties.
  • Direct observation of buried mismatch dislocation dynamics has been challenging.

Purpose of the Study:

  • To investigate the role of mismatch dislocations in oxide-to-metal interfacial transformations.
  • To elucidate the mechanism by which mismatch dislocations modulate transformation kinetics.
  • To explore the potential of utilizing structural defects for controlling mass transport.

Main Methods:

  • In-situ observation of copper oxide to copper transformation.
  • Atomistic calculations to simulate interfacial processes.
  • Analysis of dislocation climb and atomic transport mechanisms.

Main Results:

  • Mismatch dislocations intermittently pin the lateral flow of interfacial ledges during transformation.
  • Pinning occurs until dislocations climb to a new interface location.
  • Non-local transport of metal atoms to dislocation cores is identified as the cause of pinning.

Conclusions:

  • Mismatch dislocations play a critical role in modulating solid-solid interfacial transformations.
  • Structural defects at buried interfaces can be leveraged to control mass transport and kinetics.
  • Provides mechanistic insights into interfacial transformation processes.