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<p>Microstructures and hardness of high-purity silver strips prepared by hot-rolling, cold-rolling, cryo-rolling were investigated, along with their stability during annealing at various temperatures. The results indicate that the rolling effectively refines the grains, with mean grain sizes decreasing progressively as the deformation temperature decreases. Transmission electron microscopy (TEM) observations reveal a gradual increase in dislocation density and twin formation with decreasing rolling temperature. The high density of dislocations provides additional driving forces for recrystallization, leading to an increase in recrystallization degree as the rolling temperature decreases. The hardness of the strips decreases gradually with increasing annealing temperature. Notably, the hardness of the cryo-rolled strip remains consistently higher than that of the cold-rolled and hot-rolled strips. At 25&#xa0;°C annealing, a high density of dislocations persists in the strips. As the annealing temperature increases, the dislocation density gradually diminishes, while the mean grain size increases. Dislocations are scarcely observable after annealing at 250&#xa0;°C, indicating significant recrystallization in the strips.</p>

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Microstructural characteristics and stability of high-purity silver strips prepared by hot-rolling, cold-rolling, and cryo-rolling

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Yingjun Yao,
  • Shuaijiang Yan,
  • Jing Wen,
  • Richu Wang,
  • Xiang Peng,
  • Zhiyong Cai

摘要

Microstructures and hardness of high-purity silver strips prepared by hot-rolling, cold-rolling, cryo-rolling were investigated, along with their stability during annealing at various temperatures. The results indicate that the rolling effectively refines the grains, with mean grain sizes decreasing progressively as the deformation temperature decreases. Transmission electron microscopy (TEM) observations reveal a gradual increase in dislocation density and twin formation with decreasing rolling temperature. The high density of dislocations provides additional driving forces for recrystallization, leading to an increase in recrystallization degree as the rolling temperature decreases. The hardness of the strips decreases gradually with increasing annealing temperature. Notably, the hardness of the cryo-rolled strip remains consistently higher than that of the cold-rolled and hot-rolled strips. At 25 °C annealing, a high density of dislocations persists in the strips. As the annealing temperature increases, the dislocation density gradually diminishes, while the mean grain size increases. Dislocations are scarcely observable after annealing at 250 °C, indicating significant recrystallization in the strips.