The solidification structure and phase constituent of Mg-8.2Al-4.7Ca alloy ribbons prepared by melt-spinning have been observed by XRF

XRD

optical observation and micro-hardness measurements

meanwhile

the effects of rotating speed of the single-roller on the thickness and micro-hardness of the Mg alloy ribbons have been approached. The results indicate that the melt-spinning alloy ribbons are composed of amorphous phase and fine hcp-Mg（Al

Ca） phase

which is different from that of conventionally solidified alloy ribbons. It can be observed from the cross section of the ribbon that three distinct zones appears in the microstructure: fine equiaxed grain size close to the copper roller

columnar zone and coarse equiaxed grain zone close to the free surface. With the increase of rolling speed

the micro-hardness of the alloy ribbons can be increased

which is attributed to the refinement of the grain size.