Effects of different He+ irradiating ion energies on the evolution behavior of helium bubbles in dispersion-strengthened NiMo–Y2O3NP alloys
Effects of different He+ irradiating ion energies on the evolution behavior of helium bubbles in dispersion-strengthened NiMo–Y2O3NP alloys
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DOI：
10.1063/5.0097484
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发表时间：
2022-10
影响因子：
3.2
通讯作者：
Awen Liu;Hefei Huang;Zhenbo Zhu;Ruoyu Li;Wei Ji;Yan Li
中科院分区：
文献类型：
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作者：
Awen Liu;Hefei Huang;Zhenbo Zhu;Ruoyu Li;Wei Ji;Yan Li
镍基NiMo-Y2 O3 NP合金已被确定为用于先进反应堆的潜在结构材料。在这项研究中，氧化物弥散强化NiMo-Y2 O3合金的微观结构的演变行为进行了研究与具有不同的入射粒子能量（0.5，1.0，和2.0 MeV）的He+离子辐照的透射电子显微镜，模拟计算，和纳米压痕测试。实验结果表明，NiMo-Y2 O3 NP合金辐照后均产生了氦泡，其中半数以上的氦泡直径小于4 nm。随着入射He+辐照离子能量的增加，氦泡的数密度减小，但平均尺寸在误差允许范围内增大，导致损伤峰区氦泡体积分数增加。这可能是由于氦浓度的降低和空位与氦原子的比率（Vac/Vac）的增加。He）在损伤峰值区域的氦气泡中。此外，照射样品S1、S2和S3的平均纳米硬度高于未照射样品S 0的平均纳米硬度。研究了He+辐照能量对合金中氦泡演化行为的影响，为进一步研究结构材料氦致损伤缺陷演化行为提供参考。
The nickel-based NiMo–Y2O3NP alloy has been identified as a potential structural material to be used for advanced reactors. In this study, the microstructural evolution behavior of oxide-dispersion-strengthened NiMo–Y2O3 alloys irradiated with He+ ions possessing different incident particle energies (0.5, 1.0, and 2.0 MeV) was investigated by transmission electron microscopy, simulation calculations, and nanoindentation tests. The experimental results showed that helium bubbles were generated in all three irradiated samples of the NiMo–Y2O3NP alloy, where more than half of the bubbles were smaller than 4 nm in diameter. As the energy of the incident He+ irradiating ion increased, the number density of helium bubbles decreased, but their average size increased within the tolerance of the error, inducing an increase in the volume fraction of helium bubbles in the damage peak region. This could be attributed to the decrease in helium concentration and increase in the ratio of vacancies to helium atoms (Vac./He) in helium bubbles in the damage peak region. In addition, the average nanohardness of the irradiated samples S1, S2, and S3 was higher than that of the unirradiated sample S0. In this study, we evaluated the effects of He+ irradiating ion energy on the evolution behavior of helium bubbles in the alloy, providing a reference for further research on the evolution behavior of helium-induced damage defects of structural materials.