Semi-solid AlSi9Mg alloy melt was prepared by the inclined cooling slope method

and rheocasting standard specimens were prepared to measure the mechanical properties.Microstructure parameters including solid fraction

grain size and shape factor of primary phase in the alloy specimens were observed by quantitative metallographic techniques.Effects of injection specific pressure on microstructure and properties of semi-solid AlSi9Mg alloy were investigated.The results show that with increasing in injection specific pressure

solid fraction of primary phase exhibits slight change

and average diameter of grain is decreased from 74.9μm to 63.5μm

and shape factor is increased from 0.61 to 0.66.Meanwhile

mechanical properties of the specimens are certainly increased

where tensile strength

hardness and impact toughness are increased by 2.7%

3.7% and 8.6%

respectively.