Influence of magnetic field and inoculation on size reduction in pure aluminium structure

The main aim of this study was to determine common influences of two different refinement methods on EN AW-Al99,98 primary structure and developing of refinement mechanism. The first method is inoculation with small amount of (Ti+B) less than obligatory standard PN-EN 573-3 and the second method is influence of electromagnetic field on aluminium crystallisation process. These methods of structure refinement are particularly important in continuous and semicontinuous casting where products are used for plastic forming. Large columnar crystals zone result in forces extrusion rate reduction and during the ingot rolling delamination of external layers can occur. [Received on 30 March 2006; Accepted on 12 February 2007]