The thixoforging process of A356/A390 alloy composites at semi-solid state was simulated by finite element software

and filling of bimetal in the compound forming process was visualized to understand effects of forging speed and friction coefficient on compound forming.The results reveal that filling of the dissimilar materials exhibits independent relatively with low loading.Particles in compound interface is subjected to not only shear deformation but also stable pressure.When the forging speed is slow

temperature and stress of composite interface billets become uneven gradually

which leads to compound interface line closed to bottom surface of the middle of the parts slightly.When the forging speed is fast

compound interface line is closed to top surface of the middle of the parts seriously

which leads to the filling un-complete at bottom of the parts.With the forging speed of top die of 120mm/s

temperature and stress of composite interface billets exhibit uniform relatively

and billets is filled fully

so compound interface line demonstates straight at the middle.