Using a new semi-solid preparing and rheoforming machine which self-developed for light alloys in laboratory

researched effects on technology to alloy microstructure

such as shear temperature

shear speed rate

pressure force.The results show that shear not only changed the shape of α-Mg

but also changed distribution of the phase

namely α-Mg and β-Mg17Al12 eutectic structure due to grain refinement lixiviation tend to intergranular distribution equably

almost forming continuous mesh texture around α-Mg grain;the shape of semi-solid particles becomes regulate quietly

and average distribution in alloy body under high shear speed rate;the solid-phase rate of alloy structure becomes higher

and the solid-phase particles become also fine when shear temperature is low;when semi-solid AZ91D alloy is cooling and forming

applied to proper force make for structure refinement and advanced properties.