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Ion-irradiation enhancement of materials degradation in Fe–Cr single crystals detected by magnetic technique

2012; Elsevier BV; Volume: 442; Issue: 1-3 Linguagem: Inglês

10.1016/j.jnucmat.2012.11.042

1873-4820

Yasuhiro Kamada, Hideo Watanabe, Seiji Mitani, J. N. Mohapatra, Hiroaki Kikuchi, Satoru Kobayashi, Masaki Mizuguchi, Kōki Takanashi,

Metallurgical Processes and Thermodynamics

Abstract Single crystalline Fe–20%Cr film was prepared using a molecular beam epitaxy technique, and 2.4 MeV Cu2+ ion-irradiation was subsequently carried out at room temperature and at 748 K. Magnetic hysteresis measurement and magnetic domain observation showed that room-temperature irradiation did not have a large effect on the magnetic properties of Fe–20%Cr films. However, irradiation at 748 K caused a significant magnetic hardening and a drastic change in domain structures. It is assumed that the domain characteristics reflect the formation of chromium-rich precipitates due to the phase separation accelerated by irradiation. This study demonstrates the feasibility of nondestructive magnetic techniques for evaluating the materials degradation of Fe–Cr alloys under the irradiation environment.