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<p>Ni-based alloy foils were processed through cold rolling to achieve a thickness of 70&#xa0;μm, with the rolling force being the key parameter for controlling thickness. Following this, annealing was performed at temperatures ranging from 700 to 850&#xa0;°C to explore the changes in microstructure and overall properties. As the annealing temperature rose, the microstructure evolved from a recovered state to complete recrystallization at 800&#xa0;°C, which was marked by a decrease in dislocation density and an increase in grain size. The tensile strength diminished from 373.1&#xa0;MPa to 101.3&#xa0;MPa, while the maximum elongation reached 31.1% at 800&#xa0;°C. The softening of the material due to annealing resulted in a higher strain hardening exponent and a lower strength coefficient. In addition, the electrical resistivity showed a gradual decline and stabilized after annealing at 800&#xa0;°C, which was linked to a reduction in defect density and grain boundary scattering. This study illustrates that the integration of rolling and annealing techniques can effectively modify the mechanical and electrical characteristics of ultrathin Ni-based foils, laying a foundation for advanced strain gauge applications.</p>

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Modifying the mechanical and electrical characteristics of ultrathin nickel-based foils through cold rolling and brief annealing processes for strain enhancement

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Zhuhuan Yu,
  • Zi Yang,
  • Haiyan Lv,
  • Junfeng Qiang,
  • Tianxiao Ma,
  • Xirui Shangguan,
  • Ziyan Wang,
  • Haolin Guo,
  • Dongdong Zhang,
  • Xiaochao Zhang

摘要

Ni-based alloy foils were processed through cold rolling to achieve a thickness of 70 μm, with the rolling force being the key parameter for controlling thickness. Following this, annealing was performed at temperatures ranging from 700 to 850 °C to explore the changes in microstructure and overall properties. As the annealing temperature rose, the microstructure evolved from a recovered state to complete recrystallization at 800 °C, which was marked by a decrease in dislocation density and an increase in grain size. The tensile strength diminished from 373.1 MPa to 101.3 MPa, while the maximum elongation reached 31.1% at 800 °C. The softening of the material due to annealing resulted in a higher strain hardening exponent and a lower strength coefficient. In addition, the electrical resistivity showed a gradual decline and stabilized after annealing at 800 °C, which was linked to a reduction in defect density and grain boundary scattering. This study illustrates that the integration of rolling and annealing techniques can effectively modify the mechanical and electrical characteristics of ultrathin Ni-based foils, laying a foundation for advanced strain gauge applications.