Structures of dissociated 〈1 1¯ 0 0〉 dislocations and {1 1¯ 0 0} stacking faults of alumina (α-Al2O3)
Structures of dissociated 〈1 1¯ 0 0〉 dislocations and {1 1¯ 0 0} stacking faults of alumina (α-Al2O3)
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DOI：
10.1016/j.actamat.2009.08.067
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发表时间：
2010
期刊：
影响因子：
9.4
通讯作者：
E. Tochigi;N. Shibata;A. Nakamura;T. Mizoguchi;T. Yamamoto;Y. Ikuhara
中科院分区：
文献类型：
--
作者：
E. Tochigi;N. Shibata;A. Nakamura;T. Mizoguchi;T. Yamamoto;Y. Ikuhara
采用扩散键合方法制备了具有{l_brace}1 1-bar 0 0{r_brace}/<1 1 2-bar 0> 2{sup o}小角度晶界的氧化铝（{alpha}-Al{sub 2}O{sub 3}）双晶，并通过高分辨率透射电子显微镜（HRTEM）观察了晶界。发现1/3<1 1-bar 0 0>部分位错三重态沿边界周期性排列。部分位错三重态之间的{l_brace}1 1-bar 0 0{r_brace}堆垛层错内的原子结构由HRTEM结合第一性原理计算确定。我们详细讨论了堆垛层错结构及其过剩能量。
An alumina ({alpha}-Al{sub 2}O{sub 3}) bicrystal with a {l_brace}1 1-bar 0 0{r_brace}/<1 1 2-bar 0> 2{sup o} low-angle grain boundary was fabricated by diffusion bonding, and the grain boundary was observed by high-resolution transmission electron microscopy (HRTEM). It was found that 1/3<1 1-bar 0 0> partial-dislocation triplets were periodically arrayed along the boundary. The atomic structure within the {l_brace}1 1-bar 0 0{r_brace} stacking faults in between the partial-dislocation triplets was determined by HRTEM combined with first-principles calculations. We discuss the stacking fault structures and their excess energies in detail.