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Unformatted text preview: specific crystallographic
planes results in “slip bands”. Slip
HCP: Restricted to basal planes FCC: Multiple slip planes BCC: Multiple slip planes Slip bands contain many slip lines. Dilemma
Problem: Metal crystals should be about 1,000 to
10,000 times stronger than their
observed strength if one considers the
theoretical bonding strength of the
atoms. Why aren’t they this strong? Explanation: A high density of crystalline
imperfections must be present to lower
the theoretical shear strength. DISLOCATIONS
Created in materials by solidification process and
deformation processing of materials.
A small amount of stress is required for slip by
dislocations since only a small group of atoms
slip over each other at any instant. Dislocation moving through lattice Observing Dislocations...
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This document was uploaded on 02/27/2014 for the course NANO 108 at UCSD.
- Fall '13