Analysis of microstructure formation process of MgCoY amorphous ribbon by TEM observation and in-situ small angle scattering measurement

Synchrotron radiation small-angle scattering measurements and transmission electron microscopy observations have been carried out on the microstructure formation process of Mg_83.8Co_6.7Y_9.5 alloys. In the MgCoY alloy, Y clusters, which are different from the Y and Zn clusters precipitated in the initial stage in the MgZnY alloy, were precipitated from the amorphous state with increasing temperature. Subsequently, the Y clusters transformed into β′′, β′ and β phase with increasing temperature, while a stacking structure was also observed to coexist. (author)