Influence of Pouring Length on the Microstructures and Properties of Semi-solid of AlSi9Mg Alloy
The influence of pouring length on microstructure of semi-solid direct water quenched of AlSi9Mg and rheo-die cast AlSi9Mg have been researched by self developed incline cooling shear rheo-die casting device.The results show that: the pouring length has great influences on semi-solid direct water quenched microstructure of AlSi9Mg.The primary solid fraction increases along with the increase of the pouring length.The primary solid fraction is 48%,the average diameter of grains is 50 μm,the shape factor is 0.57 when the length of pouring is 500 mm.The pouring length also has great influences on microstructure of AlSi9Mg by rheo-die casting.The microstructure refined obviously.The pouring length has more effect on the primary solid fraction,but less effect on the average diameter of grains and the shape factor.When the pouring length is 500 mm,the average diameter of grain is 7.13 μm,the shape factor is 0.7.