Forging Process of Wrought Aluminum Alloy with Controlled Solid Fraction by Electromagnetic Stirring
This study demonstrates the indirect rheoforging of wrought aluminum alloys fabricated by electromagnetic stirring (EMS). EMS was carried out by varying pouring temperature of theological material and subsequently the rheo-material was forged into the sample which consisted of the direct and indirect forging part, by varying the applied forging pressure. The rheo-material completely filled the die cavity at the applied forging pressure of 150 MPa. To transfer the densification pressure to the end of the part, the applied forging pressure of over 170 MPa was necessary. To control liquid segregation, solid and liquid phases distribute uniformly by deriving the laminar flow. When liquid segregation occurred significantly during rheoforging, the strength revealed as low as 268 MPa. Investigating relationship between microstructural features and mechanical properties of the product, the rheoforged material through EMS revealed the fine and globular microstructure. Microstructure with uniform distribution of solid and liquid phase (no segregation) showed good mechanical property of the rheoforged material whose tensile strength was 341 MPa for Al6061.
G. Hirt, A. Rassili, A. Bührig-Polaczek
J.W. Bae et al., "Forging Process of Wrought Aluminum Alloy with Controlled Solid Fraction by Electromagnetic Stirring", Solid State Phenomena, Vols. 141-143, pp. 277-282, 2008