The dynamics of the irradiation-induced martensitic transformation in a single crystal of 17 13 austenitic stainless steel has been studied using the RBS channelling technique, conversion electron Mossbauer spectroscopy (CEMS), and glancing incidence X-ray diffraction (GXRD). 300 keV xenon ions were used to induce the martensitic α phase in the austenitic steel. It is shown that in the single-crystalline steel the martensitic phase occurs abruptly and covers almost all, i.e. the region near the surface of the specimen in a very short fluence increase, i.e. from 4 × 1016 to 5 × 1016ions/cm2, which suggest an introduction of a critical transition, in contrast with the fluence dependence in polycrystalline 17 7 steel specimens; in the latter case the induced phase increases gradually to a saturated amount around a fluence of (5-7) × 1016ions/cm2.
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