Effects of radiation-induced defects on microstructural evolution of Fe-Cr model alloys

J. Kwon, T. Toyama, Y. M. Kim, W. Kim, J. H. Hong

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11 Citations (Scopus)


We investigate the role of radiation-induced defects in the microstructural evolution of Fe-Cr model alloys with two approaches; a positron annihilation measurement and computer simulations. We prepared Fe-Cr model alloys with different Cr contents which were irradiated with 2 MeV-electrons at the JAEA accelerator at Takasaki in Japan. The production of vacancy-type defects was verified by positron annihilation lifetime spectroscopy. The average positron lifetimes of the irradiated samples were increased by about 14% when compared to the unirradiated one. The ratio curves, derived from a Doppler broadening measurement, did not reveal a prominent change between the irradiated pure Fe and Fe-Cr alloys, which implies that there was no formation of a vacancy-Cr complex. We performed computer simulations by using the Metropolis Monte Carlo method to predict a possible microstructure composed of Cr and vacancies. As expected, the simulation also revealed that no vacancy-Cr complexes were formed. Both results support a small amount of radiation-induced swelling in the Fe-Cr alloys.

Original languageEnglish
Pages (from-to)165-168
Number of pages4
JournalJournal of Nuclear Materials
Issue numberC
Publication statusPublished - 2009 Apr 30


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