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Sketch following modes of dislocation motion and name conditions that help them occur: 1. Cross slip 2. Climb up & climb down

Sketch following modes of dislocation motion and name conditions that help them occur: 1. Cross slip 2. Climb up & climb down

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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### Modes of Dislocation Motion To better understand dislocation motion, one can study two primary modes and the conditions under which they occur: 1. **Cross Slip** - **Overview**: Cross slip refers to the process where a screw dislocation moves from one slip plane to another. - **Conditions**: It typically occurs in metals with a face-centered cubic (FCC) crystal structure under high-stress conditions. The presence of sufficient lattice friction, temperature, and stress are crucial for cross slip to take place. 2. **Climb Up & Climb Down** - **Overview**: Climbing involves the motion of an edge dislocation perpendicular to its slip plane. The dislocation moves up (climb up) or down (climb down) by absorbing or emitting vacancies. - **Conditions**: This motion is thermally activated and commonly occurs at elevated temperatures where diffusion processes become significant. These modes of dislocation motion are fundamental in understanding the mechanical behavior of crystalline materials, particularly in the fields of materials science and engineering. Understanding these concepts is essential for designing materials with improved mechanical properties.
Transcribed Image Text:### Modes of Dislocation Motion To better understand dislocation motion, one can study two primary modes and the conditions under which they occur: 1. **Cross Slip** - **Overview**: Cross slip refers to the process where a screw dislocation moves from one slip plane to another. - **Conditions**: It typically occurs in metals with a face-centered cubic (FCC) crystal structure under high-stress conditions. The presence of sufficient lattice friction, temperature, and stress are crucial for cross slip to take place. 2. **Climb Up & Climb Down** - **Overview**: Climbing involves the motion of an edge dislocation perpendicular to its slip plane. The dislocation moves up (climb up) or down (climb down) by absorbing or emitting vacancies. - **Conditions**: This motion is thermally activated and commonly occurs at elevated temperatures where diffusion processes become significant. These modes of dislocation motion are fundamental in understanding the mechanical behavior of crystalline materials, particularly in the fields of materials science and engineering. Understanding these concepts is essential for designing materials with improved mechanical properties.
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