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The document discusses the effects of dislocation core structures on the mobility of dislocations in various materials, particularly focusing on FCC metals, diamond-cubic semiconductors, and BCC metals. It highlights the relationship between atomic structure, dislocation behavior, and mechanical properties, emphasizing recent advancements in theoretical models and simulations that enhance understanding of dislocation dynamics. Key topics include core polarization, Peierls stress, kink mechanisms, and the influence of point defects on dislocation motion. The chapter concludes with remarks on ongoing challenges in accurately modeling dislocation behavior and the importance of multiscale approaches to bridge atomistic insights with macroscopic material properties.

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What is the mobility of dislocations?

Dislocation mobility, which dictates the response of dislocations to an applied stress, is a fundamental property of crystalline materials that governs the evolution of plastic deformation.

How do dislocations affect mechanical properties?

The number and arrangement of dislocations give rise to many of the properties of metals such as ductility, hardness and yield strength. Heat treatment, alloy content and cold working can change the number and arrangement of the dislocation population and how they move and interact in order to create useful properties.

What is the dislocation effect?

Dislocations can be painful and make it hard (or impossible) to use your affected joint. Dislocations can also strain or tear the tissues around your joints, including your: Muscles. Nerves. Tendons.

What effects do dislocations have on the mechanical properties of crystalline materials?

Mechanical properties Crystallographic defects significantly influence the mechanical behavior of materials, including their strength, hardness, ductility, and toughness. Dislocations can act as obstacles to dislocation motion, strengthening the material and increasing its resistance to deformation.

What is a dislocation in crystalline materials?

In material science, dislocations are lattice defects within a crystal structure. Dislocations occur when stress is applied and can move from atom to atom, causing plastic deformation.

What is dislocation core?

Dislocation core can exist in several metastable modifications, which differ from each other by in-core atomic bonding topology. The difference between the core structures manifests itself in the difference of the core free energies, which, in turn, determine the stability of a particular core modification.

What is the effect of dislocation in crystal structures?

Dislocations are defects whose motion produces plastic deformation of crystals at stresses well below the theoretical shear strength of a perfect crystal. In fig. 1a, b and c the glide motion of an edge dislocation is shown to cause plastic shear strain.

How does the crystal structure affect mechanical properties?

Different crystal structures have different types of defects, such as vacancies, interstitials, dislocations, grain boundaries, and interfaces, that affect the mechanical properties of the material. For example, defects can act as stress concentrators, sources of plastic deformation, or barriers to propagation.

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