Deformation-enhanced Cu precipitation in Fe-Cu alloy studied by positron annihilation spectroscopy

T. Onitsuka, M. Takenaka, E. Kuramoto, Y. Nagai, M. Hasegawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The formation of Cu precipitates in Fe-1.0 wt % Cu alloy specimens enhanced by deformation has been studied by positron annihilation technique, coincidence Doppler broadening, and the positron lifetime method. In the alloy specimens quenched and 20% rolled at room temperature, the formation of Cu-vacancy clusters was observed, which evidenced the enhanced diffusion of Cu atoms by deformation-induced excess vacancies mobile at room temperature. By annealing up to 400 °C following the deformation, vacancies and vacancy clusters were dissociated from these Cu-vacancy clusters, and ultrafine Cu precipitates coherent with the Fe matrix were formed. The increase of the hardness was also observed and was attributed to the precipitation.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2002


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