The deformation of materials at cryogenic temperature is of interest for space, arctic, and fundamental science applications. In this work, a custom-built cooling system attached to a commercial picoindenter was used for in situ cryogenic microcompression testing of equal-channel angular-pressed copper with real-time electron backscatter diffraction. Stress-driven grain growth at cryogenic temperatures was observed during a series of elastic and plastic deformations. These results provide direct evidence for the previously predicted phenomenon, whereas previous ex situ examinations demonstrated coarsening after cryogenic loading when samples were not maintained at cryogenic temperatures between deformation and characterization.

中文翻译：

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通过微压缩和原位电子背散射衍射观察到的低温应力驱动晶粒生长

材料在低温下的变形对空间、北极和基础科学应用很感兴趣。在这项工作中，连接到商用 picoindenter 的定制冷却系统用于具有实时电子背散射衍射的等通道角压铜的原位低温微压缩测试。在一系列弹性和塑性变形过程中观察到低温下应力驱动的晶粒生长。这些结果为先前预测的现象提供了直接证据，而先前的非原位检查表明，当样品在变形和表征之间没有保持在低温下时，低温加载后会变粗。