Effect of γ-ray irradiation on Nd–Fe–B alloys

Han, Young Chul; Lee, Song; Kwon, H. W.; Kang, Young Soo

doi:10.1016/j.nimb.2007.04.071

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2016

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“…Very little attention was paid regarding the effects of γ-rays on structure and mechanical properties of nuclear materials. It was reported that Nd-Fe-B alloys, widely used as magnets in radiation environments, amorphized after γ radiation at room temperature [6]. Hardening and structural disorder were also reported for Al alloys [7] and ferritic steels used in RPVs [8].…”

Section: Introductionmentioning

confidence: 94%

Structural and mechanical properties of γ-irradiated Zr/Nb multilayer nanocomposites

2016

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Zr/Nb multilayers with periodicities of 10, 30 and 60 nm were prepared by magnetron sputtering and irradiated for prolonged time (1311 h) by γ-rays with energy of 1.25MeV and a dose of 510 kGy. A qualitative comparison between XRD patterns acquired before and after irradiation revealed a progressive increase of compressive stress, especially in Nb layers, for smaller periodicities with a consequent increase in hardness measured by nanoindentation. The combination of smaller grain size and radiationinduced defect density distribution, primarily in Nb layers, was found to be responsible for the observed radiation hardening effect.

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Section: Introductionmentioning

confidence: 94%