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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

60
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
60
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

49
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
49

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A Novel Method for In Situ Electromechanical Characterization of Nanoscale Specimens
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Understanding dislocation mechanics at the mesoscale using phase field dislocation dynamics.

I J Beyerlein1, A Hunter2

  • 1Theoretical Division, Los Alamos National Laboratory, PO Box 1663 MS B261, Los Alamos, NM 87545, USA irene@lanl.gov.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 23, 2016
PubMed
Summary
This summary is machine-generated.

Phase field dislocation dynamics (PFDD) models mesoscale mechanics, integrating atomic simulations for materials like FCC and BCC metals. This versatile technique bridges scales, offering insights into deformation mechanisms and material behavior.

Keywords:
crystalsdislocationsgrain boundariesinterfacesmetals

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Area of Science:

  • Materials Science
  • Computational Mechanics
  • Condensed Matter Physics

Background:

  • Mesoscale mechanics techniques are crucial for understanding material deformation.
  • Bridging atomistic and continuum scales remains a challenge in materials modeling.

Purpose of the Study:

  • To present the formulation, recent developments, and findings of phase field dislocation dynamics (PFDD).
  • To demonstrate the versatility of PFDD in modeling various material structures and deformation phenomena.

Main Methods:

  • Phase field dislocation dynamics (PFDD) simulations.
  • Integration with atomic-scale simulations.
  • Modeling of face-centered cubic (FCC) and body-centered cubic (BCC) materials.

Main Results:

  • Advancements in modeling partial dislocations in FCC materials.
  • Understanding grain size effects on slip behavior and deformation twinning.
  • Extensions to BCC metals, two-phase materials, free surfaces, and voids.

Conclusions:

  • PFDD is a powerful and versatile mesoscale method.
  • PFDD bridges length and time scales effectively.
  • PFDD provides crucial understanding of deformation mechanisms.