TEM study and magnetic measurements of precipitates formed in Cu-Fe-Ni alloy

The precipitation behavior of Cu-Fe alloys with Ni addition on isothermal annealing at 878K was investigated by means of transmission electron microscopy (TEM) and SQUID measurements. Nano-scale coherent particles were randomly formed at the initial stage of the precipitation process. The ordering trend was outstanding that two or more nano-scale particles cubic in shape are linearly aligned at later stages of the precipitation. Finally linear chains of the precipitates were formed along the ≪100≫ orientations of Cu matrices in the ternary Cu-Fe-Ni alloys. The present SQUID measurements revealed several significant influences to magnetic properties were induced during the precipitation in Cu-Fe-Ni alloys.