Ivan Anžel, Albert C. Kneissl, Rebeka Rudolf, Alojz Križman
May 5, 2013
Rapidly solidified ribbons of Cu-0.7 at.% Zr alloy have been produced by the melt spinning process. An overall assessment of the ribbons shows that the microstructure consists of two morphological zones: a zone with columnar grains at the wheel side and a zone with fine equiaxed grains at the top side of the ribbons. The columnar zone consists of fine Cu-Zr intermetallic particles inside the grains, while in the equiaxed zone we have fine precipitates inside the grains and coarser ones at their boundaries. Transmission electron microscopy was carried out to quantify the coarsening process of the particles. Analysis of particle size showed that the grain boundary particles coarsened noticeably faster than the particles within the copper grains, which coarsened in both morphological zones by bulk diffusion, controlled by the diffusivity of zirconium, and r 3 —t relationship was obtained at all temperatures of the experiment.