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The mechanical behavior of 3 mol% Y 2 O 3 -ZrO 2 ceramic and 21 wt.% Al 2 O 3 -3 mol% Y 2 O 3 -ZrO 2 ceramic composite with submicron grain size was studied. Mechanical properties, such as hardness, Young's modulus, four-point bending strength, and fracture toughness of both materials were measured. Linear stress-strain deformation behavior of both 3 mol% Y 2 O 3 -ZrO 2 and 21 wt.% Al 2 O 3 -3 mol% Y 2 O 3 -ZrO 2 was observed in flexure, both at room temperature and at 400 °C. A small deviation from linear elastic deformation was detected in 21 wt.% Al 2 O 3 -3 mol% Y 2 O 3 -ZrO 2 ceramic composite when loaded above a stress of 1500 MPa. Therefore, it was concluded that only elastic deformation occurred at low stresses upon loading, which exclude the presence of domain switching in zirconia upon bending under the loading conditions of this study.

Strength Analysis and Stress-Strain Deformation Behavior of 3 mol% Y-TZP and 21 wt.% Al2O3-3 mol% Y-TZP