Stability and Surface Energies of Wetted Grain Boundaries in Aluminum Oxide
Stability and Surface Energies of Wetted Grain Boundaries in Aluminum Oxide
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氧化铝中润湿晶界的稳定性和表面能
DOI：
10.1111/j.1151-2916.1994.tb07013.x
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发表时间：
1994
影响因子：
3.9
通讯作者：
J. Blendell
中科院分区：
文献类型：
--
作者：
Doh;S. Wiederhorn;B. Hockey;C. Handwerker;J. Blendell
研究了1650°C下蓝宝石两近基面间钙铝硅酸盐液膜的稳定性。制备的样品在整个界面上具有6-7°约<1010 °的平均基底取向差。界面的取向与[0001]方向成0° ~ 1038 °。观察到三种类型的界面：多面的，固-液界面;低角度晶界排列阵列的位错组成;和边界的位错和多面的固-液界面的交替区域组成。所观察到的界面的类型取决于界面的取向，并可以通过使用基于武尔夫形状的构造来预测。由于界面的类型取决于晶体取向和界面角，这些结果表明一个绝对的方法来确定润湿边界的表面自由能。
The stability of a calcium-aluminum-silicate liquid film between two near-basal plane surfaces of sapphire at 1650°C was studied. Samples were prepared having an average basal misorientation across the interface of 6–7° about < 〈1010〉. The interfaces varied in orientation from 0° to ∼38° to the [0001] direction. Three types of interfaces were observed: faceted, solid-liquid interfaces; low-angle grain boundaries consisting of aligned arrays of dislocations; and boundaries consisting of alternating regions of dislocations and faceted solid-liquid interfaces. The type of interface observed depended on the orientation of the interface and could be predicted by using a construction based on Wulff shapes. Because the type of interface depends on crystal alignment and interface angle, these results suggest an absolute method of determining the surface free energy of wetted boundaries.