Direct measurements of grain boundary sliding in yttrium-doped alumina bicrystals
Direct measurements of grain boundary sliding in yttrium-doped alumina bicrystals
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DOI：
10.1063/1.1555690
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发表时间：
2003-02
影响因子：
4
通讯作者：
K. Matsunaga;H. Nishimura;H. Muto;Takahisa Yamamoto;Y. Ikuhara
中科院分区：
文献类型：
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作者：
K. Matsunaga;H. Nishimura;H. Muto;Takahisa Yamamoto;Y. Ikuhara
采用双晶实验，在高温下直接测量了纯Al2O3和掺钇Al2O3的晶界滑动行为。为此，我们制备了含有随机晶界或不含钇离子的Al2O3双晶。高分辨率透射电镜观察和能量色散x射线能谱分析表明，双晶在原子尺度上成功结合，掺杂的钇离子沿晶界分离。通过压缩蠕变试验发现，与未掺杂双晶相比，添加钇使晶界滑动速率降低了两个数量级。
The behavior of grain boundary sliding in pure and yttrium-doped Al2O3 was directly measured at a high temperature, using bicrystal experiments. For this purpose, we fabricated Al2O3 bicrystals containing a random grain boundary with or without yttrium ions. High-resolution transmission electron microscopy observations and energy dispersive x-ray spectroscopy analyses showed that bicrystals were successfully joined at an atomic scale, and doped yttrium ions segregated along the grain boundaries. It was found by compressive creep tests that the grain boundary sliding rate was restrained by two orders of magnitude due to yttrium addition, as compared to that of undoped bicrystals.