Effect of Cation Doping on the Superplastic Flow in Yttria‐Stabilized Tetragonal Zirconia Polycrystals
Effect of Cation Doping on the Superplastic Flow in Yttria‐Stabilized Tetragonal Zirconia Polycrystals
复制标题
阳离子掺杂对氧化钇稳定四方氧化锆多晶超塑性流动的影响
DOI：
10.1111/j.1151-2916.2001.tb00920.x
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发表时间：
2004
影响因子：
3.9
通讯作者：
T. Sakuma
中科院分区：
文献类型：
--
作者：
Junpei Mimurada;Manabu Nakano;Kazutaka Sasaki;Y. Ikuhara;T. Sakuma
研究了不同阳离子掺杂氧化钇稳定的四氧化锆多晶（Y-TZP）的超塑性特性。对于1摩尔%的阳离子掺杂的Y-TZP的真实应力是非常依赖于掺杂的阳离子的离子半径;例如，较小的阳离子半径产生较低的真实应力时，与其他组合物相比，相同的晶粒尺寸，应变速率，和测试温度。改变的真实应力水平必须是由于在氧化锆中添加阳离子引起的晶界滑动的调节过程中的扩散率的变化。掺杂的氧化锆的断裂应变受掺杂剂阳离子的离子半径和价态的影响。
The superplastic characteristics of various cation-doped yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) were examined. For 1 mol% cation doping the true stress of Y-TZP is very dependent on the ionic radii of the doped cations; for instance, smaller cation radii give rise to lower true stress when compared with the other compositions for the same grain size, strain rate, and testing temperature. The altered true stress level must be due to the change in diffusivity of the accommodation process for grain boundary sliding caused by the addition of cations in ZrO2. The strain to failure of the doped zirconia is affected by both ionic radius and valence of the dopant cations.