Semi-solid alloy melt with different primary structure was prepared by inclined cooling-shearing rheocasting

and spiral samples were made by semi-solid squeezing casting. Characteristic parameters

such as solid phase fraction

grain size and shape factor

of primary phase structure and spiral sample at different filling length were investigated by quantitative metallographic technique to understand effects of filling pressure and filling velocity on primary structure of the semi-solid alloy melt during filling process. The result show that when spiral samples are made by semi-solid squeezing casting with filling pressure of 20

1

20MPa and filling velocities of 0.2

1

.2 m/s

the solid phase fraction

grain size and shape factor along the filling length exhibits wave-like change with little amplitude

and the position of peak and trough has no definitely relation with the filling length.