Ce-TZP陶瓷的压缩应力应变特性

STRESS-STRAIN CHARACTER OF Ce-TZP CERAMICS UNDER COMPRESSION

本文采用宏微观相结合的方法,对12mol％Ce-TZP+10wt％Al_2O_3陶瓷材料的压缩应力应变特性进行了研究。通过实验首次发现该材料在室温下应力应变关系的伪弹性行为,证实了在加卸载过程中材料内部发生的可逆马氏体相变机理,并同时讨论了室温下材料内部出现可逆铁弹性畴转的可能性。最后就上述两种机理对静止与扩展裂纹的增韧效应进行了分析,提出了可逆相变条件下的增韧计算公式。

The ferroelastic and pseudoelastic toughening mechanisms in 12mol％Ce-TZP+10wt％Al_2O_2 ceramics have been investigated by a macro-micro combined approach. The pseudoelastic behavior of the material during loading and unloading cycles was found for the first time at room temperature and the corresponding reversible martensitic transformation mechanism was verified. The existence of reversible ferroelastic domain switching.mechanism at room temperature was discussed. Finally the toughening effects of these two mechanisms were analysed and a formula for pseudoelastic toughening calculation was proposed.