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<p>The microstructure and cryogenic mechanical properties have been investigated in a CoCrFeNi alloy cold rolled to 95% thickness&#xa0;reduction and subsequently annealed to produce either partially recrystallized or fully recrystallized samples. A combination of high yield strength (1&#xa0;GPa), high ultimate tensile strength (1.4 GPa), and good ductility (42%) is obtained at − 196°C in a sample with a recrystallized area fraction of 62%. It is demonstrated that plastic deformation at this temperature results in profuse twinning within recrystallized grains. The strength and ductility of each cryogenically tested sample are found to be higher than those at room temperature.</p> Graphical Abstract <p></p>

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Cryogenic mechanical behavior of CoCrFeNi alloy at different stages of recrystallization

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月3日

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  • Liuyang Yu,
  • Hao Zhang,
  • Wanquan Zhu,
  • Grethe Winther,
  • Guilin Wu,
  • Oleg V. Mishin

摘要

The microstructure and cryogenic mechanical properties have been investigated in a CoCrFeNi alloy cold rolled to 95% thickness reduction and subsequently annealed to produce either partially recrystallized or fully recrystallized samples. A combination of high yield strength (1 GPa), high ultimate tensile strength (1.4 GPa), and good ductility (42%) is obtained at − 196°C in a sample with a recrystallized area fraction of 62%. It is demonstrated that plastic deformation at this temperature results in profuse twinning within recrystallized grains. The strength and ductility of each cryogenically tested sample are found to be higher than those at room temperature.

Graphical Abstract