Magnetic minor hysteresis loops of neutron-irradiated Fe-Cu-Ni-Mn model alloys varying Cu and Ni contents have been measured. For almost alloys minor-loop coefficients which are in proportion to internal stress decrease after neutron irradiation to a maximum fluence of 0.44×1019 n cm−2. The decrease of the coefficients is strongly enhanced for alloys with high Cu and high Ni contents. Both magnetic and mechanical properties are correlated with each other and the coefficients are roughly in inverse proportion to yield strength.
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