Irradiation Effects in Ni-17Mo-7Cr Alloy Bombarded with MeV Au Ions

doi:10.1007/s40195-015-0274-0

Abstract

Abstract:

Irradiation effects in Ni-17Mo-7Cr alloy have been systematically investigated by using 3 MeV Au ions at different fluences ranging from 8 × 10¹³ cm^-2 to 2.3 × 10¹⁵ cm^-2, corresponding to doses of 1-30 dpa. The results indicated that sample microstrain increased gradually from 0.14 to 0.22% as dose increased from 0 to 30 dpa. Besides, the nanohardness of Ni-17Mo-7Cr alloy increased with irradiation dose until 10 dpa, and then, softening effect became dominant while further increasing dose to 30 dpa. After being irradiated at room temperature, the swelling rate of Ni-17Mo-7Cr alloy was found to be around 0.04% per dpa. These data are helpful in estimating the irradiation resistance of this newly developed Ni-17Mo-7Cr alloy in nuclear energy systems.

Key words: Ni-base, alloy, Swelling, rate, Radiation, damage, Nanoindentation

Peng Guo, Jian-Ming Xue, Long Yan, Qing Huang, Zhi-Jun Li, Ping Huai, Xing-Tai Zhou. Irradiation Effects in Ni-17Mo-7Cr Alloy Bombarded with MeV Au Ions[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7): 903-908.

Figures/Tables 6

Table 1 Nominal chemical composition of the Ni-17Mo-7Cr alloy (wt%)

C	Si	Mn	Fe	Cr	Mo	Ni
0.05	0.5	0.5	4	7	17	Bal.

Fig. 1 SRIM simulation of damage profiles produced by 3 MeV Au2+ ion irradiation to a dose of 8 × 1013 cm-2 in Ni-17Mo-7Cr alloy

Fig. 2 Normalized GIXRD patterns a, the microstrain b of Ni-17Mo-7Cr alloy samples irradiated with 3 MeV Au ions at different doses

Fig. 3 AFM image of the irradiated and unirradiated zone a, the measured step height b of the Ni-17Mo-7Cr alloy specimen

Fig. 4 Near-surface hardness as a function of contact depth a, the hardness of the samples as a function of dose at 100-nm contact depth b

Fig. 5 Raman spectra of the Ni-17Mo-7Cr alloy samples a, areas of D and G peaks at different doses b

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