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<p>Defect activation is critical to both microstructure evolution and property tailoring. However, a detailed understanding of this process in ribbons under external stimulation remains limited, largely due to constraints imposed by their shape and size. In this work, the microstructure evolution and its influence on the mechanical properties of micro-alloyed Co/Ni in Fe-B-P-C-Cu ribbons were investigated through nanoindentation techniques. Both doped ribbons exhibited a pronounced rate-dependent softening, shown by reductions in reduced modulus and hardness of approximately 13.48% and 29.33% for the Co-added alloy, and 20.53% and 43.51% for the Ni-added alloy, respectively. Also, a significant “pop-in” event in the Ni-added alloy during initial loading revealed the premature activation of more defects. Using the Maxwell-Voigt model, the defect activation during creep deformation was detected by the relaxation time spectrum. In contrast to the Co-added alloy, where defects were more likely to be activated at early loading rates, the Ni-added alloy exhibited a simultaneous activation of two types of defects as the loading rate increased. Such unique activation of defects resulted in varying responses of the microstructures to external stimuli, manifesting in distinct mechanical behaviors.</p>

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Micro-alloying effects of Co/Ni on microstructure and mechanical behavior of FeBPCCu alloy under nanoindentation

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Meng Wang,
  • Wenjun Liu,
  • Zhongkai Guo,
  • Lu Wang,
  • Dianguo Ma,
  • Guixing Zheng,
  • Lanju Liang,
  • Weiming Yang,
  • Long Hou

摘要

Defect activation is critical to both microstructure evolution and property tailoring. However, a detailed understanding of this process in ribbons under external stimulation remains limited, largely due to constraints imposed by their shape and size. In this work, the microstructure evolution and its influence on the mechanical properties of micro-alloyed Co/Ni in Fe-B-P-C-Cu ribbons were investigated through nanoindentation techniques. Both doped ribbons exhibited a pronounced rate-dependent softening, shown by reductions in reduced modulus and hardness of approximately 13.48% and 29.33% for the Co-added alloy, and 20.53% and 43.51% for the Ni-added alloy, respectively. Also, a significant “pop-in” event in the Ni-added alloy during initial loading revealed the premature activation of more defects. Using the Maxwell-Voigt model, the defect activation during creep deformation was detected by the relaxation time spectrum. In contrast to the Co-added alloy, where defects were more likely to be activated at early loading rates, the Ni-added alloy exhibited a simultaneous activation of two types of defects as the loading rate increased. Such unique activation of defects resulted in varying responses of the microstructures to external stimuli, manifesting in distinct mechanical behaviors.