Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
766579 | Engineering Fracture Mechanics | 2015 | 10 Pages |
•The maximum fracture toughness of BZT–38.5BCT decreases with increasing temperature.•We observed an exclusively transgranular fracture for BZT–38.5BCT.•We correlate the ferroelastic shielding behavior with the ferroelastic properties.
The temperature-dependent crack growth resistance behavior of the lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 (x = 0.385) ceramic was characterized using compact-tension specimens from 25 °C to 60 °C. The observed plateau fracture toughness at 25 °C was found to be approximately 37% lower than commercial Pb(Zr,Ti)O3. At elevated temperature, the maximum fracture toughness displayed a decrease, which was found to be related to the temperature-dependent elastic and ferroelastic properties. Mechanical measurements are presented that demonstrate decreasing effective switching strain, coercive stress and Young’s modulus with increasing temperature.