These strengthening methods are based on hindrance of dislocation movement.
Deformation hardening means strengthening by cold work e.g. strip and sheet
rolling, wire drawing, hammering. Alloy hardening involves hardening by the
reaction of dislocation lines with foreign atoms (alloying elements).
Depending on the distribution of the foreign atoms they affect the lattice in
different ways and the hardening depends on whether the foreign elements are in
solution or precipitated in the aluminium lattice. It is therefore most
convenient to divide alloy hardening into two kinds: solid solution hardening and
precipitation hardening.
Strengthening of the alloys (Topic: 10037)