Abstract
A study of mechanical and magnetic hardening in the CuNiCo alloy has shown that two distinct mechanisms are responsible for two types of hardening. The mechanical hardening of the alloy, which occurs after a short ageing time is due, according to Cahn's theory, to the mechanical stresses induced by the spinodal decomposition of the supersaturated solid solution. Magnetic hardening, which occurs much later than mechanical hardening, is due to the appearance of the ferromagnetic γ1 phase, which reaches single domain particle size during a discontinuous transformation process by volume growth and segregation between the γ- and γ-phases.
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