Abstracts Nanocrystalline (NC) metals have high strength, but are highly susceptible to grain growth at elevated temperatures due to the driving force to reduce the energy stored at grain boundaries (GBs). In this study, we compared the thermal stability of NC Ni alloy with conventional thin GBs and thick GBs. Thermomechanical treatment was applied to induce thick GBs in the Ni alloy. After annealing at 800 °C, significant grain growth occurs in the Ni alloy with thin GBs; whereas the nanograins with Mo-rich thick GBs remain stable. This study provides a fresh perspective on improving the thermal stability of NC alloys.

中文翻译：

---

通过厚晶界调整纳米晶镍合金的热稳定性

摘要 纳米晶 (NC) 金属具有高强度，但由于降低存储在晶界 (GB) 的能量的驱动力，在高温下极易发生晶粒生长。在这项研究中，我们比较了 NC Ni 合金与常规薄 GB 和厚 GB 的热稳定性。应用热机械处理以在 Ni 合金中诱导厚 GB。在 800 °C 下退火后，具有薄 GB 的 Ni 合金发生显着的晶粒长大；而具有富钼厚 GB 的纳米颗粒保持稳定。该研究为提高 NC 合金的热稳定性提供了新的视角。