The individual crystal units comprising the aggregate structure where the crystalline orientation does not change. The grain boundary is where these individual crystal units meet.

构成总的结构的单个的晶体个体，而晶体的方位并没有发生变化。晶界是这些单个的晶体单位相遇的界限。

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Imaging with scanning transmission electron microscopy showed that the atomic grain-boundary structure had dislocations that had very similar arrangement.

扫描电子显微镜图像显示这两种晶界原子结构中的位错排列十分相似。

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The results showed that grain boundary width and grain boundary form of the aluminum alloy would change during superplastic deformation.

结果表明，此状态下的铝合金在超塑性变形过程中晶界宽度和形态会发生改变。

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The engine had been running at high temperatures for four times longer than a normal F-35 flight, causing a separation of the "grain boundary" on one blade, Mr Bates explained.

BBC: Grounded US F-35 fighter jet fleet to resume flights