Spinodal-like decomposition of Fe-35Ni and Fe-Cr-35Ni alloys during irradiation or thermal aging

Fe-35Ni and Fe-Cr-35Ni alloys appear to thermally decompose in a spinodal-like but very sluggish manner at temperatures between ~ 400 to 800°C, with the miscibility gap spanning nickel levels of ~ 30 to 40%. When irradiated with either charged particles or neutrons at these temperatures, the instability is accelerated and the miscibility gap widens to span ~ 25 to 50% Ni, developing very large and temperature-dependent wavelengths. This …