Here, we apply the electron backscatter diffraction (EBSD) technique to identify grain boundaries (GBs) in a metal sheet surface, and the metal sheet is subsequently deformed via contact with a hard nanomold. Quantified by the length of molded nanorods, combining with molecular dynamics (MD) simulations and transmission electron microscopy (TEM) characterization, the microstructure evolution and the important influence of individual GBs on plastic deformation during nanomolding of crystalline Ag at different temperatures and stresses are revealed. Diffusion-based mechanisms become dominant once the temperature is above a critical value ($T_{\text{tran}}\sim 0.54T_{\mathrm{m}})$, and the GB-affected zone in this temperature range is measured as several micrometers, approximately 3-4 orders of magnitude larger than the structural width of GBs. Finally, benefiting from the decoded GB-based deformation mechanism, we demonstrate that the prevalent deformation mechanism map can be experimentally constructed with high efficiency based on the proposed method. Our findings provide new insights into the individual GB-based deformation mechanism at high temperature and show the importance of developing new methods for constructing deformation mechanism maps to experimentally quantify specific deformation mechanisms.

在这里，我们应用电子背散射衍射 (EBSD) 技术来识别金属板表面的晶界 (GB)，然后金属板通过与硬纳米模具接触而变形。通过模制纳米棒的长度量化，结合分子动力学 (MD) 模拟和透射电子显微镜 (TEM) 表征，揭示了在不同温度和应力下晶体 Ag 纳米成型过程中单个 GB 的微观结构演变和对塑性变形的重要影响. 一旦温度高于临界值（${吨}_{\text{反式}}～0.54{吨}_{\mathrm{米}})$，并且该温度范围内的 GB 影响区测量为几微米，比 GB 的结构宽度大约 3-4 个数量级。最后，受益于解码的基于 GB 的变形机制，我们证明了基于所提出的方法可以高效地通过实验构建流行的变形机制图。我们的研究结果提供了对高温下基于 GB 的单个变形机制的新见解，并表明开发用于构建变形机制图的新方法以实验量化特定变形机制的重要性。