Abstract
Fracture experiments were done on 3 mol% Y-TZP ceramics from room temperature to 4.2 K. X-ray diffraction analysis was used to study the phase contents of the ceramics. The monoclinic phase content and fracture toughness, KIc, all increase with decreasing temperature, which is mainly due to the stress-induced transformation. On the other hand, the spontaneous transformation also takes a part in toughening.
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