Effect of heavy ion irradiation dose rate and temperature on α′ precipitation in high purity Fe-18%Cr alloy

Zhao, Yajie; Bhattacharya, Arunodaya; Pareige, C.; Massey, Caleb; Zhu, Pengcheng; Poplawsky, Jonathan D.; Henry, J.; Zinkle, Steven J.

doi:10.1016/j.actamat.2022.117888

Cited by 20 publications

(2 citation statements)

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“…It has been reported that phase separation is enhanced by irradiation when the irradiation flux is relatively low and the cascade mixing effect is small, even in the low-temperature range where separation does not occur by thermal aging [11,12]. In the studies investigating the magnetic properties of ion-irradiated Fe- (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)%Cr films, an increase in coercivity and magnetization was reported [13][14][15]. The irradiation-enhanced phase separation is considered the reason behind these phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…By thermal aging, the Fe-Cr solid solution is known to undergo phase separation into Fe-rich and Cr-rich phases at high temperatures [8], which affects the magnetization process of the alloys [9,10]. It has been reported that phase separation is enhanced by irradiation when the irradiation flux is relatively low and the cascade mixing effect is small, even in the low-temperature range where separation does not occur by thermal aging [11,12]. In the studies investigating the magnetic properties of ion-irradiated Fe- (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)%Cr films, an increase in coercivity and magnetization was reported [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Hardening of Heavily Helium-Ion-Irradiated Iron–Chromium Alloys

Kamada,

Umeyama,

Murakami

et al. 2024

Metals

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This study reports on the magnetic hardening phenomenon of heavily helium ion-irradiated iron–chromium alloys. The alloys are important structural materials in next-generation nuclear reactors. In some cases, problems may arise when the magnetic properties of the materials change due to neutron irradiation. Therefore, it is necessary to understand the effects of irradiation on magnetism. Helium irradiation was conducted as a simulated irradiation, and the effect of cavity formation on magnetic properties was thoroughly investigated. High-quality single-crystal Fe-x%Cr (x = 0, 10, 20) films, with a thickness of 180–200 nm, were fabricated through ultra-high vacuum evaporation. Subsequently, irradiation of 19 dpa with 30 keV He+ ions was conducted at room temperature. X-ray diffraction measurements and electron microscopy observations confirmed significant lattice expansion and the formation of high-density cavities after irradiation. The magnetization curve of pure iron remained unchanged, while magnetic hardening was noticed in iron–chromium alloys. This phenomenon is believed to be due to the combined effect of cavity formation and changes in the atomic arrangement of chromium.

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