a) Explain why metals are ductile and ceramics are brittle, in terms of their dislocation motion.
b) Draw 2 pictures to sequentially show an edge dislocation gliding through a crystal, using dots to represent the atoms.
c) Draw 2 pictures to show how a dislocation can climb by capturing a vacancy.
d) What factors limit dislocation mobility?
e) What positive and negative effects does limiting dislocation mobility have on mechanical properties?