Discussion
Mechanical behaviour of a crystalline ceramic material is best described as
Answer: B
A crystalline ceramic is best described as brittle.
Ceramics are bonded ionically or covalently. Their dislocations are few and hard to move, because slip would bring like charges together or break directional bonds, so they cannot deform plastically at room temperature. They fail by fast fracture from small flaws, with little or no plastic strain, which is brittle behaviour.
Ductility is typical of metals, with their mobile dislocations. Viscoelastic and viscoplastic behaviour describe time-dependent flow, typical of polymers and of glasses or metals at high temperature, not crystalline ceramics under ordinary conditions.
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