Figure 2.18 Dislocations in niobium under increasing strain. There is an increase in
dislocation density (From Harris,
B.
and Bunsell,
A.
R.,
The Structure
and
Properties
Engineering
Materials,
Longman)
applied to the material to cause a precipitation to occur within the material.
The alloying of metals involves the introduction of foreign atoms into the
crystal lattice. These produce interstitial and substitutional point defects
which hinder the movement of dislocations, hence increasing the yield stress.
This is referred to as
solution
hardening.
Dislocations can annihilate each other if they are of opposit ...
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