Temperature dependence of anelastic behavior in 3Y-TZP ceramics
Temperature dependence of anelastic behavior in 3Y-TZP ceramics
复制标题
3Y-TZP 陶瓷迟弹性行为的温度依赖性
DOI：
10.1016/s0921-5093(97)00027-0
复制
发表时间：
1997
期刊：
影响因子：
6.4
通讯作者：
S. Horibe
中科院分区：
文献类型：
--
作者：
L. Pan;N. Imai;S. Horibe
在77-353K的不同温度范围内观察到了3Y-TZP中独特的滞弹性行为。利用弹性应变减除器和原位X射线衍射技术，我们发现3Y-TZP在较高的温度下更容易发生滞弹变形，而在77K时这种滞弹行为明显消失，并且滞弹性应变不是由t→m相变引起的。在循环加载中，还测量了每个温度下的应力-滞弹性应变滞回曲线。从这些环的形状变化，探讨了3Y-TZP滞弹变形的可能机制。此外，尽管在较低温度下循环软化并不强烈，但在所有温度下都观察到了循环软化。研究了该材料在不同温度下的断裂强度。结果表明，3Y-TZP无裂纹试样在较低温度范围内的持久强度明显高于较高温度范围内的持久强度。然而，在预裂纹样中，由于与滞弹性行为有关的机制，在较高温度下观察到的无裂纹样的强度降低可以在一定程度上得到补救。
The unique anelastic behavior in 3Y-TZP has been observed under several temperatures in the range 77–353 K. By employing an elastic strain subtractor and in-situ XRD technique, we found that the anelastic deformation of 3Y-TZP occurred more easily at an elevated temperature, whereas this anelastic behavior disappears dramatically at 77 K, and that the anelastic strain was not induced by the t → m phase transformation. In the cyclic loadings, the stress versus anelastic strain hysteresis loops were also measured at each temperature. From the shape change of these loops, the possible mechanisms of anelastic deformation of 3Y-TZP were explored. Furthermore, the cyclic softening was observed at every temperature although it was not strong at the lower temperature. The rupture strengths of this material at different temperatures were investigated as well. It was found that the rupture strength of 3Y-TZP non-crack sample was obviously higher in the lower temperature range than in the higher temperature range. However, in pre-cracked samples, the strength reduction observed in the non-crack sample at higher temperatures could be remedied to some extent due to the mechanism related to anelastic behavior.