Abstract
Transformation yield and plasticity, transformation zone sizes at crack tips and rising crack-growth-resistance (R-curve) behaviours were studied in a commercial-grade ceria partially stabilized zirconia polycrystalline material (CeO2-TZP). The yield stresses measured in three-point bending decreased from 390 to 176 MPa when the sintering temperature was varied from 1425 to 1525° C. The corresponding total plastic strain to fracture increased with decreasing yield stress. Crack-tip transformation zones in precracked, annealed and loaded single-edge-notch-bend specimens decreased significantly in size with increasing transformation yield stress; however, the R-curves were relatively insensitive to the yield stresses or the transformation zone sizes. The measured zone sizes and R-curves were examined in terms of both crack shielding and plastic yield strip zone models.
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Yu, CS., Shetty, D.K. Transformation yielding, plasticity and crack-growth-resistance (R-curve) behaviour of CeO2-TZP. J Mater Sci 25, 2025–2035 (1990). https://doi.org/10.1007/BF01045759
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DOI: https://doi.org/10.1007/BF01045759