Electromagnetic Method to Control the Solidification of Al99.99

• Published in: Journal of materials engineering and performance 2019-07, Vol.28 (7), p.3929-3934
• Main Authors: Pokusová, Marcela, Murgašová, Marta, Berta, Igor, Murgaš, Marián, Pribulová, Alena
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Tribology
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-019-03972-w

The paper presents the electromagnetic method for control the solidification of the pure Al99.99%. For experiments, the treatments using (1) the flow of an alternating current of 500 A and (2) the simultaneous action of a DC magnetic field (0.035 or 0.07 T) and an alternating current of 500 A were applied. The as-cast aluminum structure obtained under only an alternating current action was formed with the coarse crystallites being the shape of a plate with a thickness of 5 mm and a transverse dimension from 3 to 30 mm. The simultaneous action of a DC magnetic field and an alternating current resulted in grain refinement. Under a magnetic field of 0.035 T, the surface layer of the 0.8 mm thickness made up of the equiaxed grains with a size from 300 to 400 µm, and the target’s central zone formed with crystallites being of a size from 500 µm to 1.2 mm were observed. Under magnetic field of 0.07 T, the structure was formed with the fine equiaxed grains of 20-80 µm. The theoretical analysis was carried out to identify the processes involved in control of the solidification process of Al99.99 under the electromagnetic method.