The influence of recycled material proportion on the size and content of inclusion in A356 aluminum alloy was investigated. Effects of recycled material addition on the stability of mechanical properties were analyzed by mechanical property test

and influence of rotary injection refining process parameters on density

inclusion size and content of aluminum melt were analyzed. The results indicate that with increase of recycled material proportion

the size and content of the inclusions in the alloy are increased

and the mechanical performance stability is decreased. The efficiency of degassing and impurity removal can be improved by properly increasing the rotation speed and gas flow or setting appropriate gas pressure. For A356 aluminum alloy melt with 30% recycled material

the optimized refining process parameters present as follows: Rotor speed of 500 r/min

gas pressure of 0.8 MPa and gas flow of 20 L/min. On this condition

the aluminum melt density can reach 2.657 g/cm~3

and the volume fraction of inclusions can be decreased to 0.08%

satisfying production requirement.