Mechanical vibration was conducted in process of filling and solidification of A356 alloy to understand effects of mechanical vibration frequency

vibration amplitude and vibration direction angle on the gas hole

grain and mechanical properties of the alloy.The results show that mechanical vibration on A356 alloy can reduce the number of pinholes in the alloy

and be helpful for gas hole moving to riser.With the increase of mechanical vibration frequency

tensile strength and elongation of the A356 alloy are increased firstly and then decreased

and the maximum values can be obtained with the mechanical vibration frequency of 30 Hz.In addition

with the increase of mechanical amplitude

the tensile strength and elongation of the alloy are increased firstly and then decreased

and the maximum value can be observed with the vibration amplitude of 0.3mm.Meanwhile

with the increase of mechanical vibration direction angle

tensile strength and elongation of the A356 alloy aredecreased gradually.The proper mechanical vibration parameters of A356 alloy are presented as follows:vibration frequency of 30 Hz and vibration amplitude of 0.3mm as well as direction angle of vibration of 90°.