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<p>Understanding the microstructural evolution under different irradiation sources is crucial for assessing nuclear structural material performance. This study investigates the irradiation response of FeCr alloys (FCC structure) irradiated at 300&#xa0;°C with 7.5&#xa0;MeV Au ions (to 58&#xa0;dpa) and 5&#xa0;MeV protons (to 0.6&#xa0;dpa). The TEM results reveal significant dislocation defect formation in both cases. Au-ion irradiation produced a high density of uniformly distributed dislocation loops, predominantly of the 1/3 &lt; 111 &gt; type. In contrast, proton irradiation led to the formation of helical dislocation lines accompanied by fewer dislocation loops. This distinct defect morphology under proton irradiation is attributed to enhanced vacancy-mediated dislocation climb. Nanoindentation measurements show that Au-ion irradiation increased the alloy hardness by 16%, whereas proton irradiation resulted in a modest 6% increase. The presence of extensive dislocation lines under proton irradiation promotes dislocation loop annihilation and restricts their growth, thereby accounting for the significantly lower irradiation hardening effect compared to Au-ion irradiation.</p>

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Au-Ion and Proton Irradiation-Induced Damage and Hardening in Face-Centered Cubic FeCr Alloy

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Wenzhen Song,
  • Zhitong He

摘要

Understanding the microstructural evolution under different irradiation sources is crucial for assessing nuclear structural material performance. This study investigates the irradiation response of FeCr alloys (FCC structure) irradiated at 300 °C with 7.5 MeV Au ions (to 58 dpa) and 5 MeV protons (to 0.6 dpa). The TEM results reveal significant dislocation defect formation in both cases. Au-ion irradiation produced a high density of uniformly distributed dislocation loops, predominantly of the 1/3 < 111 > type. In contrast, proton irradiation led to the formation of helical dislocation lines accompanied by fewer dislocation loops. This distinct defect morphology under proton irradiation is attributed to enhanced vacancy-mediated dislocation climb. Nanoindentation measurements show that Au-ion irradiation increased the alloy hardness by 16%, whereas proton irradiation resulted in a modest 6% increase. The presence of extensive dislocation lines under proton irradiation promotes dislocation loop annihilation and restricts their growth, thereby accounting for the significantly lower irradiation hardening effect compared to Au-ion irradiation.