The irradiation effects on the nanoindentation hardness and helium bubbles evolution mechanism of Ni-based alloy

Lv, Shasha; Shen, Yuanhua; Zhu, Rui; Zhou, Qin; Shi, Li; Sun, Libin; Li, Zhengcao

doi:10.1016/j.radphyschem.2023.110763

Cited by 3 publications

(1 citation statement)

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“…This kind of helium bubble aggregation behavior is common in the irradiation study of nanometer multilayer composites. Previous work has shown that helium bubbles and cavities preferentially form in the grain boundaries of ultrafine and nanocrystalline tungsten, as well as other composite structures [16][17][18][19][20]. Li et al [21] found that helium bubbles gathered along the Fe/W interface by irradiating Fe/W nanolayered composites with He ions.…”

Section: Surface Topographymentioning

confidence: 99%

Evaluation of Radiation Response in CoCrFeNiNb0.65 Eutectic High-Entropy Alloys

Wang¹,

Zhu²,

Li³

et al. 2023

Preprint

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A CoCrFeNiNb0.65 eutectic high-entropy alloys (EHEAs) prepared by arc melting were irradiated with a 100 keV He+ ion beam. Swelling, helium bubbles and mechanical response induced by irradiation were evaluated. When the ion fluence reached 1.0×1018 ions/cm2, the irradiation-induced swelling occurred on the sample surface, and as the ion fluence increasing, the swelling became increasingly severe and the surface of Nb-rich phase appeared peeling and shedding. Meanwhile, along the boundaries of matrix and Nb-rich phase there was a neat line of helium bubbles. The size of these helium bubbles decreased with distance from the center of the helium bubble layer. This result indicated that the phase boundaries were favorable sites for the nucleation and gathering of helium bubbles. Nanoindentaion results indicated that hardening and softening induced by He+ ion irradiation occurred in various ion fluences. At ion fluence of 5.0×1017 ions/cm2, the CoCrFeNiNb0.65 EHEAs exhibited an obvious hardening behavior, which can be explained by dislocation-dominated hardening effect. When the ion fluence reached 1.0×1018 ions/cm2 and 2.0×1018 ions/cm2, the hardening effect decreased probably due to the helium bubble aggregation and growth, as well as helium bubbles induced noncompact structures. The results of this study provide insights into the effect of helium bubbles on mechanical evolution and pave the way for designing EHEAs suitable for the nuclear industry.

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