Analysis of Microstructure Formation Process of MgCoY Amorphous Ribbon by TEM Observation and <i>In-Situ</i> 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 Mg83.8Co6.7Y9.5 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.