The Redistribution of Atoms During Radiation-Induced Martensitic Transformations in Fe-Ni Alloys

Using the nuclear gamma resonance (NGR) spectroscopy, a low-temperature (400-500K) isothermal BCC < -- > FCC transformation was found to occur in Fe-(31-32%) Ni alloys subjected beforehand to shear under a high pressure. The phase transformation was stimulated by irradiation with high-energy electrons (E approx5.5 MeV, dose F approx5bullet10 exp 18 e/cm exp -2 ). The BCC+FCC structure of the binary Fe-Ni alloy, which is produced under the deformation pressure, undergoes either the alpha - > gamma or gamma - > alpha radiation-induced martensitic transformation depending on the initial (before strain) state: gamma -phase or alpha -phase.