8-Mechanical Behavior

Dislocation moving through lattice observing

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Unformatted text preview: Dislocations are observed in the transmission electron microscope in thin metal foils. They appear as lines due to the atomic disarray at the dislocation which interfere with the transmission path of the electron beam. Transmission Electron Microscopy of Dislocations Surface Slip Steps Slip Steps Created by the Passage of Dislocations Slip Steps are Composed of Numerous Dislocation Steps Surface Slip Steps Slip Systems Dislocations produce atomic dispalcements on the most densely packed planes (slip planes) and in the most densely packed directions (slip directions) Slip plane and slip direction define a slip system. Closed Packed Planes Closest Packed Planes and Directions in FCC Closest Packed Planes and Directions in BCC {110} planes < 111 > directions {112} planes < 111 > directions Slip in Hexagonal Crystals Slip Systems in FCC Requirements for Slip The stress required to cause slip depends on: 1.  Crystal structure 2.  Atomic bonding 3.  Temperature o...
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This document was uploaded on 02/27/2014 for the course NANO 108 at UCSD.

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