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49. Dislocations Intersections Jogs and Kinks

Niraj Chawake2022-03-16
screw dislocation#dislocations#dislocation#edge dislocation#dislocation motion#dislocation interaction#intersecting dislocations#dislocation line#dislocation line and burgers vector#Dislocation intersection#Jog#Kink#break in the dislocation line#slip plane
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💫 Short Summary

The video explains how dislocations in materials interact to form breaks known as jogs and kinks. Jogs are out of the original slip plane, while kinks remain in the same plane, increasing dislocation energy and hindering motion. The Burgers vector influences jog formation, impacting material properties significantly. Edge dislocations prevent movement on slip planes, leading to strain hardening. Vacancies play a role in dislocation movement and climb processes. Understanding these mechanisms is crucial for material behavior under stress and temperature.

✨ Highlights
📊 Transcript
Formation of Jogs and Kinks in Dislocations.
Jogs are segments of dislocation lines that are out of the original slip plane.
Kinks are breaks that remain in the same plane as the dislocation.
These breaks increase the energy of dislocations and impede their motion, leading to strain hardening.
Jogs and kinks are formed by the intersection of dislocations and can have a significant impact on material properties.
Explanation of jogs and kinks in dislocation lines.
Jogs are breaks on dislocation lines on the same slip plane, while kinks are a subset of jogs on the same glide plane.
Dislocations intersect to form jogs or kinks based on the direction and length of the Burgers vector.
Jogs move along the Burgers vector direction and are perpendicular to each other.
Steps created by jogs have a magnitude equal to the Burgers vector of the intersecting dislocation, with steps out of the glide plane called jogs.
Formation of breaks on dislocations due to intersections with other dislocations.
Breaks occur on certain dislocations based on the relationship between purchase vectors and tangent vectors.
Jog formation and edge character are introduced to explain the nature of breaks.
Characteristics of skew dislocations and how breaks are formed when they intersect are explored.
Magnitude of breaks is determined by the purchase vector.
Formation of jogs on dislocations in materials science.
Jogs are created when screw dislocations with perpendicular Burgers vectors intersect, forming edge dislocations that hinder movement on slip planes.
Edge dislocations lead to strain hardening in materials by preventing slip.
Age dislocations with different Burgers vectors can intersect, forming breaks that impact dislocation movement.
Analysis of these breaks provides insights into material behavior under stress.
Formation of kinks on dislocations.
Kinks are formed on different slip planes with specific magnitudes and directions.
Kinks are created when two dislocations intersect and are identified as 'kinks'.
The nature of kinks is determined by tangent and purchase vectors, having a screw nature.
The segment also discusses the interaction between different dislocations and the formation of breaks on the same slip plane.
Understanding breaks and kinks in dislocations, specifically focusing on screw dislocations.
Breaks with an edge nature on screw dislocations cannot glide on certain planes and must climb instead.
A break, known as a jog on the screw dislocation, cannot glide on specific planes due to the orientation of the purchase vector and tangent vector.
Knowledge of these characteristics aids in determining the movement and behavior of dislocations in materials.
Movement of dislocations on different planes involves climbing and formation of vacancies.
Jogs with edge characteristics can hinder the movement of screw dislocations, requiring a climb process.
Vacancies act as sources or sinks for jogs, influencing their movement under stress or temperature.
Formation of jogs on dislocation lines impedes movement and necessitates a climb process involving vacancy formation.
Vacancies joining with an extra half plane lead to the formation of jogs, impacting the climb process of dislocations.
Formation or annihilation of vacancies during the climb process is crucial for moving chalks and kicks.
The process involves stress and thermal activation.
This mechanism is highlighted as important in the overall process.