Define toughness
The resistance to fracture/cracking
Define dislocation
A linear defect of atoms
Describe what occurs at the yield strength in a metal
Dislocations move allowing the metal to flow
State mechanisms to strengthen metals
Atoms in solution
Second phases
Other dislocations
Boundaries
Name two ways foreign atoms can be placed within a structure
Substitutional
Interstitial
How does adding additional phases strengthen a metal?
It blocks dislocations from moving
This can involve adding lots of an alloying element to create a second phase
State two ways of adding dislocations into a metal
Work hardening
Strain hardening
How does reducing grain size help to strengthen a metal?
It increases the number of boundaries, preventing dislocations from moving through the metal
