Based on the cooling slope method

the semi-solid 7A09 aluminum alloy billets was prepared by the self-designed device.Effects of the pouring temperature

the angle of inclined tube and the rotating speed of straight tube on the microstructure of the billet were analyzed by orthogonal experiment

meanwhile

influence of every experimental parameter on the formation of the billet microstructure was further explored

respectively.The results show that the pouring temperature has the largest effect on the average size and shape factor of the grains

and then the angle of inclined pipe

then the rotating speed of straight pipe.The semi-solid billet with good quality can be prepared at the pouring temperature of approximately 630 ℃

the angle of inclined pipe between 45°and 60°as well as the rotating speed of straight pipe between 70r/min and 100r/min.