The area confined between grains in polycrystalline materials can undergo phase transformations under external stimuli, providing prospects for materials design based on grain boundary phase engineering.

中文翻译：

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界面上的阶段

多晶材料中晶粒之间的区域可以在外部刺激下发生相变，为基于晶界相工程的材料设计提供了前景。