Microstructural evolution and domain structure of cobalt particles precipitated in a cooper matrix

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The present research group revealed that the precipitation behavior in a Cu-Co alloy is affected by the magnetic interaction between cobalt atoms/ clusters. Since few systematic works have been accumulated so far, details and fundamental understanding of the phenomena has not obtained yet. The present study consists of the following parts ; (1) TEM study of the influence of the magnetic field externally applied to the alloy specimen, (2) magnetic measurements to investigate the relationship of the magnetic domain structure and magnetic property, (3) the Monte Carlo simulation to consider the influence of the field to the Co-particle formation and (4) Lorentz microscopy of the domain structure.The precipitation of the solute was accelerated by applying the magnetic field, although the shapes of the particles did not receive the influence. Teh influence of the field more explicitly appeared at the later stage of the precipitation. The critical size to coherent-incoherent transition of the precipitate is likely to receive slight influence. The magnetic moment of the alloy specimen was affected with the microstructure of the specimen. The specimen containing Co-clusters shows a M-T curve dependent of the existence of the field. An incoherent Co-precipitate comprised multiple magnetic domains to reduce the electrostatic energy.