Manufacturing Industry
Alloy Compositions for SEMISOLID FORMING.
Advanced Materials & Processes, March, 2000 by Kazakov, Alexander A.
Alexander A. Kazakov [*] Semi-solid forming produces excellent surface quality and precise finished part geometry, high strength, and good plastic properties, but the alloy composition must be very carefully selected. Semi-solid forming is a production method that combines the elements of casting and forging.
The process consists of three sequential stages: rheocasting, reheating, and forming. The rheocasting stage involves magneto-hydrodynamic stirring of the alloy at the solidification front; this yields billets with nondendritic (thixotropic) microstructures (Fig. 1a). During the reheating stage, the slugs from the thixotropic billet are heated in an induction furnace. When they reach the semi-solid state temperature, they contain equal amounts of...
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