Question
1
of
20
Multiple Choice
Zirconium dioxide ceramics are protected to a degree from fracture by a process called transformation toughening. When a crack arises in the material:
Select the correct answer.
an enlarged tetragonal crystal acts as a crack stopper, preventing the crack from propagating
the increase in energy caused by the crack causes a transformation of surrounding tetragonal crystals to the slightly larger monoclinic form, which closes the crack
the increase in energy caused by the crack causes a transformation of surrounding monoclinic crystals to the slightly larger tetragonal form, which closes the crack
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