On grain boundary dislocations in plane matching grain boundaries
On grain boundary dislocations in plane matching grain boundaries
复制标题
平面匹配晶界中的晶界位错
DOI：
10.1002/pssa.2210560243
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
R. Balluffi
中科院分区：
文献类型：
--
作者：
R. Schindler;J. E. Clemans;R. Balluffi
平面匹配（PM）边界被定义为相邻边界的每个晶体中的单个指数平面（hkl）堆叠平行或接近平行，并且不存在其他重要的晶格匹配的边界。通过透射电子显微镜（透射电子显微镜）搜索可能存在于具有各种偏离精确PM条件的边界中的本征二次晶界位错（GBD）阵列。（002），（220）和（420）的PM边界控制几何在金薄膜双晶样品。引入了大范围的扭曲和倾斜偏离精确的PM取向，并且在固定晶体取向错误的情况下，边界面的取向也会发生变化。在（002）和（220）边界中发现了由并行gbd组成的数组，但在（420）边界中没有发现。GBDs的Burgers矢量平行于（hkl），其大小由（hkl）面间距给出。在晶界面取向范围很广的晶界面中，晶界面上的扭转偏差可达4/sup 0/，倾斜偏差可达14/sup 0/。结果表明，在相当大的定向偏差范围内（在某些情况下可能高达20/sup /），离散GBDs应该存在于（002），（111）和（220）PM边界的各种更多»中。因此，与沃灵顿和布恩的估计一致，这种边界应该在一般多晶材料中出现得相当频繁。指出目前还不了解这种GBD结构稳定性的物理基础。«少
Plane matching (PM) boundaries are defined as boundaries in which a single stack of planes of indices (hkl) in each crystal adjoining the boundary is either parallel, or nearly parallel, and where no other significant lattice matching exists. A search was made (by transmission electron microscopy) for possible intrinsic secondary grain boundary dislocation (GBD) arrays which might be present in such boundaries possessing a variety of deviations from the exact PM condition. (002), (220) and (420) PM boundaries of controlled geometry were prepared in gold thin film bicrystal specimens. Wide ranges of twist and tilt deviations from the exact PM orientation were introduced, and the orientation of the boundary plane was also varied for cases of fixed crystal misorientation. Arrays consisting of parallel GBDs were found in the (002) and (220) boundaries but not in the (420) boundaries. The Burgers vector of the GBDs was parallel to (hkl) with a magnitude given by the (hkl) interplanar spacing. Arrays were found in boundaries with twist deviations as large as 4/sup 0/ and tilt deviations as large as 14/sup 0/ and with a wide range of grain boundary plane orientations. The results suggest that discrete GBDs should be present in a varietymore » of (002), (111) and (220) PM boundaries over a considerable range of misorientation which in certain cases may be as large as 20/sup 0/. Such boundaries should therefore appear rather frequently in general polycrystalline materials in agreement with the estimates of Warrington and Boon. It is pointed out that the physical basis for the stability of such GBD structures is not understood at present.« less