engleski

INFLUENCE OF THE PROCESSING ROUTE ON THE MICROSTRUCTURE FORMATION AT SEMI-SOLID TEMPERATURES FOR ALUMINUM ALLOY A380

In this study, the influence of the material processing route for semi-solid thixoforming process was investigated. The main aim of this research was to achieve globular microstructure during samples heating at semi-solid temperatures. In order to achieve globular microstructure equal channel angular pressing (ECAP) was used to deform originally casted dendritic microstructure. During reheating of the cold worked billet in the semi-solid temperature range, partial remelting should result with extremely fine, uniform, and nondendritic spherical microstructure. Therefore, ECAPed specimens were subsequently heated at the appropriate temperatures above solidus to get a globular structure of A380 (AlSi9Cu3(Fe)) aluminum alloy. The microstructural evolutions during semi-solid heating at different holding times were carried out utilizing optical microscope. Conclusion indicated that the microstructure was significantly influenced by holding time. Also, it was demonstrated that slurry composed of spheroidal solid primary particles within a liquid matrix could be achieved by reheating (in semi-solid range) of the heavily deformed specimens. Finally, it was confirmed that ECAP is a promising route for processing of the semi-solid raw materials for thixoforming.

semi-solid ; aluminum ; ECAP ; globular microstructure ; thixoforming

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