Abstract
Both Neel temperature (T N ) and spin freezing temperature (T f ) of γ Mn solid solutions in aged Mn-20Cu-8Ni-2Fe (at%) alloys are determined with zero-field-cooling (ZFC) susceptibility measurement. Using the known data for binary Mn-Cu alloys, the equivalent Mn concentrations in Mn-enriched and Cu-enriched regions were estimated as a function of the aging time, and the changes in the concentration with the aging time indicate that the spinodal decomposition mode is still effective in the phase decomposition of Mn-Cu alloys. Meanwhile, the peak susceptibility at T f temperatures and average unit cell dimensions suggest that the Cu-enriched regions behave to be the matrix fraction during the decomposition reaction.
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