Evaluation of irradiation hardening of ion-irradiated V-4Cr-4Ti and V-4Cr-4Ti-0.15Y alloys by nanoindentation techniques

Takeshi Miyazawa, Takuya Nagasaka, Ryuta Kasada, Yoshimitsu Hishinuma, Takeo Muroga, Hideo Watanabe, Takuya Yamamoto, Shuhei Nogami, Masahiko Hatakeyama

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Abstract

Irradiation hardening behavior of V-4Cr-4Ti and V-4Cr-4Ti-0.15Y alloys after Cu-ion beam irradiation were investigated with a combination between nanoindentation techniques and finite element method (FEM) analysis. The ion-irradiation experiments were conducted at 473 K with 2.4 MeV Cu2+ ions up to 7.6 dpa. For the unirradiated materials, the increase in nanoindentation hardness with decreasing indentation depth, so-called indentation size effect (ISE), was clearly observed. After irradiation, irradiation hardening in the measured depth was identified. Hardening behavior of bulk-equivalent hardness for V-4Cr-4Ti-0.15Y alloy was similar to that for V-4Cr-4Ti alloy. Y addition has little effect on irradiation hardening at 473 K. Adding the concept of geometrically necessary dislocations (GNDs) to constitutive equation of V-4Cr-4Ti alloy, the ISE was simulated. A constant value of α = 0.5 was derived as an optimal value to simulate nanoindentation test for ion-irradiated V-4Cr-4Ti alloy. Adding the term of irradiation hardening Δσirrad. to constitutive equation with α = 0.5, FEM analyses for irradiated surface of V-4Cr-4Ti alloy were carried out. The analytic data of FEM analyses based on neutron-irradiation hardening equivalent to 3.0 dpa agreed with the experimental data to 0.76 dpa. The comparison indicates that irradiation hardening by heavy ion-irradiation is larger than that by neutron-irradiation at the same displacement damage level. Possible mechanisms for extra hardening by heavy ion-irradiation are the processes that the injected Cu ions could effectively produce irradiation defects such as interstitials compared with neutrons, and that higher damage rate of ion-irradiation enhanced nucleation of irradiation defects and hence increased the number density of the defects compared with neutron-irradiation.

Original languageEnglish
Pages (from-to)440-444
Number of pages5
JournalJournal of Nuclear Materials
Volume455
Issue number1-3
DOIs
Publication statusPublished - Dec 2014

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Nanoindentation
nanoindentation
hardening
Hardening
Irradiation
Ions
irradiation
evaluation
Ion bombardment
ion irradiation
ions
Neutron irradiation
neutron irradiation
indentation
Indentation
Heavy Ions
finite element method
constitutive equations
Constitutive equations
Heavy ions

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Evaluation of irradiation hardening of ion-irradiated V-4Cr-4Ti and V-4Cr-4Ti-0.15Y alloys by nanoindentation techniques. / Miyazawa, Takeshi; Nagasaka, Takuya; Kasada, Ryuta; Hishinuma, Yoshimitsu; Muroga, Takeo; Watanabe, Hideo; Yamamoto, Takuya; Nogami, Shuhei; Hatakeyama, Masahiko.

In: Journal of Nuclear Materials, Vol. 455, No. 1-3, 12.2014, p. 440-444.

Research output: Contribution to journalArticle

Miyazawa, T, Nagasaka, T, Kasada, R, Hishinuma, Y, Muroga, T, Watanabe, H, Yamamoto, T, Nogami, S & Hatakeyama, M 2014, 'Evaluation of irradiation hardening of ion-irradiated V-4Cr-4Ti and V-4Cr-4Ti-0.15Y alloys by nanoindentation techniques', Journal of Nuclear Materials, vol. 455, no. 1-3, pp. 440-444. https://doi.org/10.1016/j.jnucmat.2014.07.059
Miyazawa, Takeshi ; Nagasaka, Takuya ; Kasada, Ryuta ; Hishinuma, Yoshimitsu ; Muroga, Takeo ; Watanabe, Hideo ; Yamamoto, Takuya ; Nogami, Shuhei ; Hatakeyama, Masahiko. / Evaluation of irradiation hardening of ion-irradiated V-4Cr-4Ti and V-4Cr-4Ti-0.15Y alloys by nanoindentation techniques. In: Journal of Nuclear Materials. 2014 ; Vol. 455, No. 1-3. pp. 440-444.
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abstract = "Irradiation hardening behavior of V-4Cr-4Ti and V-4Cr-4Ti-0.15Y alloys after Cu-ion beam irradiation were investigated with a combination between nanoindentation techniques and finite element method (FEM) analysis. The ion-irradiation experiments were conducted at 473 K with 2.4 MeV Cu2+ ions up to 7.6 dpa. For the unirradiated materials, the increase in nanoindentation hardness with decreasing indentation depth, so-called indentation size effect (ISE), was clearly observed. After irradiation, irradiation hardening in the measured depth was identified. Hardening behavior of bulk-equivalent hardness for V-4Cr-4Ti-0.15Y alloy was similar to that for V-4Cr-4Ti alloy. Y addition has little effect on irradiation hardening at 473 K. Adding the concept of geometrically necessary dislocations (GNDs) to constitutive equation of V-4Cr-4Ti alloy, the ISE was simulated. A constant value of α = 0.5 was derived as an optimal value to simulate nanoindentation test for ion-irradiated V-4Cr-4Ti alloy. Adding the term of irradiation hardening Δσirrad. to constitutive equation with α = 0.5, FEM analyses for irradiated surface of V-4Cr-4Ti alloy were carried out. The analytic data of FEM analyses based on neutron-irradiation hardening equivalent to 3.0 dpa agreed with the experimental data to 0.76 dpa. The comparison indicates that irradiation hardening by heavy ion-irradiation is larger than that by neutron-irradiation at the same displacement damage level. Possible mechanisms for extra hardening by heavy ion-irradiation are the processes that the injected Cu ions could effectively produce irradiation defects such as interstitials compared with neutrons, and that higher damage rate of ion-irradiation enhanced nucleation of irradiation defects and hence increased the number density of the defects compared with neutron-irradiation.",
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AU - Nagasaka, Takuya

AU - Kasada, Ryuta

AU - Hishinuma, Yoshimitsu

AU - Muroga, Takeo

AU - Watanabe, Hideo

AU - Yamamoto, Takuya

AU - Nogami, Shuhei

AU - Hatakeyama, Masahiko

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