Size effects in indentation measurements of Zr–1Nb–0.05Cu alloy

Yan, Chunguang; Wang, Rongshan; Wang, Yanli; Wang, Xitao; Li, Zhi; Bai, Guanghai; Zhang, Yanwei

doi:10.1016/j.msea.2015.01.024

Cited by 13 publications

(2 citation statements)

References 35 publications

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“…The hardness measured at deep regions beyond nitrogen diffusion layers, in the present study, was about 2-4 GPa. This agrees with previous studies on Zr-1Nb-0.05Cu alloy, which reported 2.7 GPa [27], and the molecular dynamics simulation result, which was about 5 GPa [28].…”

Section: Discussionsupporting

confidence: 93%

ZrN Phase Formation, Hardening and Nitrogen Diffusion Kinetics in Plasma Nitrided Zircaloy-4

et al. 2021

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Plasma nitridation was conducted to modify the surfaces of Zircaloy-4. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman analysis were used to characterize microstructures and phases. Surface indentation and cross-sectional indentation were performed to evaluate mechanical property changes. Nitridation forms a thin layer of ZrN phase, followed by a much deeper layer affected by nitrogen diffusion. The ZrN phase is confirmed by both TEM and Raman characterization. The Raman peaks of ZrN phase show a temperature dependence. The intensity increases with increasing nitridation temperatures, reaches a maximum at 700 °C, and then decreases at higher temperatures. The ZrN layer appears as continuous small columnar grains. The surface polycrystalline ZrN phase is harder than the bulk by a factor of ~8, and the nitrogen diffusion layer is harder by a factor of ~2–5. The activation energy of nitrogen diffusion was measured to be 2.88 eV. The thickness of the nitrogen-hardened layer is controllable by changing the nitridation temperature and duration.

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Section: Discussionsupporting

confidence: 93%

ZrN Phase Formation, Hardening and Nitrogen Diffusion Kinetics in Plasma Nitrided Zircaloy-4

et al. 2021

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“…That is to say, it exhibits an indentation size effect (ISE). In our previous research that there exist ISEs of activation energy and activation volume in creep deformation and the creep mechanism transits from diffusion through dense dislocations of small indents to dislocation glide of large indents [35].…”

Section: Indentation Creep Testingmentioning

confidence: 93%