Nanoindentation hardness and its extrapolation to bulk-equivalent hardness of F82H steels after single- and dual-ion beam irradiation

Takayama, Yuzi; Kasada, Ryuta; Sakamoto, Yoshiki; Yabuuchi, Kiyohiro; Kimura, Akihiko; Ando, Masami; Hamaguchi, Dai; Tanigawa, Hiroyasu

doi:10.1016/j.jnucmat.2012.12.033

Cited by 80 publications

(24 citation statements)

References 18 publications

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“…The curve of the unirradiated Ni-17Mo-7Cr alloy show a good linearity in the range of h > 67 nm, whereas the bilinearity with the critical indentation depth (hc) of 230 and 260 nm were observed in case of the ion dose of 0.33 and 6.6 dpa, respectively. As reported by Takayama et al, 21) the bilinear behavior is due to the SSE. Noticing that the critical indentation depth (230260 nm) is around 1/6 of the damage layer depth (1400 nm).…”

Section: Nanoindentation Testsupporting

confidence: 65%

Nanostructure Variations and Their Effects on Mechanical Strength of Ni-17Mo-7Cr Alloy under Xenon Ion Irradiation

Huang

et al. 2014

Mater. Trans.

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A nickel-base high-temperature alloy (Ni-17Mo-7Cr) has been characterized by nanoindentation and transmission electron microscopy to determine the changes of nanoindentation hardness and microstructural evolution under ion irradiation. Ion irradiation experiments for bulk and thin-foil specimens of Ni-17Mo-7Cr alloy were carried out at room temperature, up to 6.6 dpa, by 7 MeV Xe 26+ and 1 MeV Xe 20+ ions, respectively. The continuous stiffness measurement (CSM) with a diamond Berkovich indent was used to measure the depth profile of hardness. Nanoindentation results for bulk specimens showed an evident ion irradiation induced hardening phenomenon, and the nanoindentation hardness increases with increasing ion dose. High number density of nano-scale black spots and linear-like defects were observed in thin-foil specimens irradiated at 0.33 and 6.6 dpa, respectively. High-resolution transmission electron microscopy images revealed that the black spots were nanoscale solute clusters and dislocation loops, while the linear-like defects were found to be Ni, Mo and Cr-enrichment regions by using the highangle annular dark field-scanning transmission electron microscope. The ion irradiation induced defects can be responsible for the hardening of Ni-17Mo-7Cr alloys.

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Section: Nanoindentation Testsupporting

confidence: 65%

Nanostructure Variations and Their Effects on Mechanical Strength of Ni-17Mo-7Cr Alloy under Xenon Ion Irradiation

Huang

et al. 2014

Mater. Trans.

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“…Therefore, nanoscale methods of testing and characterizing on irradiated materials should be taken into account. Nano-indentation, an ultra-small scale measuring method for investigating mechanical properties, has been widely used to investigate irradiated materials [15,16]. The hardness (H) vs. depth (h) profile can be continuously obtained by continuous stiffness measurement (CSM) technique.…”

Section: Introductionmentioning

confidence: 99%

Helium and hydrogen irradiation induced hardening in CLAM steel

Liu

Wan

et al. 2015

Fusion Engineering and Design

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“…In contrast, in Figure 8b, the dislocations are found to be entangled with one other. Y. Takayama et al [27] found that nickel element addition enhances the irradiation hardening of RPV steel during the irradiation process. Ni and Mn elements are reported to have the tendency to promote the formation of interstitial loops during irradiation [28][29][30] and the high dose of irradiation could generate high density of self-interstitial atoms by the cascade effect which results in the formation of interstitial-type dislocation loops [31,32].…”

Section: Nano-hardnessmentioning

confidence: 99%

Effect of Heavy Ion Irradiation Dosage on the Hardness of SA508-IV Reactor Pressure Vessel Steel

Bai

Liaw

et al. 2017

Metals

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Specimens of the SA508-IV reactor pressure vessel (RPV) steel, containing 3.26 wt. % Ni and just 0.041 wt. % Cu, were irradiated at 290 • C to different displacement per atom (dpa) with 3.5 MeV Fe ions (Fe 2+ ). Microstructure observation and nano-indentation hardness measurements were carried out. The Continuous Stiffness Measurement (CSM) of nano-indentation was used to obtain the indentation depth profile of nano-hardness. The curves showed a maximum nano-hardness and a plateau damage near the surface of the irradiated samples, attributed to different hardening mechanisms. The Nix-Gao model was employed to analyze the nano-indentation test results. It was found that the curves of nano-hardness versus the reciprocal of indentation depth are bilinear. The nano-hardness value corresponding to the inflection point of the bilinear curve may be used as a parameter to describe the ion irradiation effect. The obvious entanglement of the dislocations was observed in the 30 dpa sample. The maximum nano-hardness values show a good linear relationship with the square root of the dpa.

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Nanoindentation hardness and its extrapolation to bulk-equivalent hardness of F82H steels after single- and dual-ion beam irradiation

Cited by 80 publications

References 18 publications

Nanostructure Variations and Their Effects on Mechanical Strength of Ni-17Mo-7Cr Alloy under Xenon Ion Irradiation

Nanostructure Variations and Their Effects on Mechanical Strength of Ni-17Mo-7Cr Alloy under Xenon Ion Irradiation

Helium and hydrogen irradiation induced hardening in CLAM steel

Effect of Heavy Ion Irradiation Dosage on the Hardness of SA508-IV Reactor Pressure Vessel Steel

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