Chapter 7 (Dislocations & Strengthening)
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in what type of material are dislocations most commonly found?
Metals
why are metals more prone to dislocations?
• because of non-directional bonding 2. because they are closed packed
why are covalent materials less prone to dislocations
because of their angular bonding
what type of deformations are caused by plastic deformation?
Plastic deformations
what requires LESS STRESS breaking a material or deforming it.
Deforming it
what is a slip system comprised of
a slip direction and a slip plane
which planes are typically favored by slip systems
the more closely packed ones; eg FCC
what can be said about same sign dislocations versus opposite sign dislocations
same signs repel, opposite signs attract and annihilate upon joining (no more dislocation)
give an example of a slip system for FCC
{111},
why are HCP metals brittle
because they have FEW slip systems
what can be said about ionically bonded materials regarding slip
they are able to resist slip due to disruptions in charge balance