Radiation-induced segregation of nitrogen implanted into iron

Abstract

Nitrogen redistribution toward the sample surface during the implantation processes performed at temperatures ranging from room temperature to 250 °C was studied for pure iron by means of nuclear reaction analysis and secondary-ion-mass spectrometry. The role of carbon and radiation defects was investigated. The results reveal the importance of radiation defects on nitrogen migration and trapping. The migration mechanism was identified as a radiation-induced segregation.

Phase transformations in the Fe-Nsystem induced by the concomitant use of ion irradiation and temperature

“…They can be qualitatively described in the framework of the theory of Martin (1984) and Martin and Bellon (1988) if we assume for the radiation-enhanced di usion mechanism the existence of N-vacancy pairs, as has been done elsewhere (Millard-Pinard et al 1993, Jagielski et al 1994. They can be qualitatively described in the framework of the theory of Martin (1984) and Martin and Bellon (1988) if we assume for the radiation-enhanced di usion mechanism the existence of N-vacancy pairs, as has been done elsewhere (Millard-Pinard et al 1993, Jagielski et al 1994.…”

“…However, very recently Millard-Pinerd et al (1993) and Jagielski et al (1994) explained results on radiationinduce segregation of N in Fe by assuming the existence of a mechanism in which N atoms migrate bound to vacancies, the so-called Miller pairs (Le Claire 1979). However, very recently Millard-Pinerd et al (1993) and Jagielski et al (1994) explained results on radiationinduce segregation of N in Fe by assuming the existence of a mechanism in which N atoms migrate bound to vacancies, the so-called Miller pairs (Le Claire 1979).…”