Extrusion test of 6063 alloy DC billets having complete feathery crystals in an industrial scale

Abstract

The extrusion energy required for solid shape extrusion calculated from average pressure and the extrusion time are reduced in accordance with increase in the area ratio of feathery crystals in the cross section of a billet. Complete feathery crystal billets requires the extrusion time shortened by about 25 to 35% from that usual granular crystal billets do when extruded at 390°C, 0.45m/min and at extrusion ratio 49. Such a fact is not so significant in hollow shape extruding. The extrudability of the complete feathery billets considerably depend on the extruding direction. Extruding in the growth direction ensures further extrudability than extruding in the casting direction regardless of the extruding condition and products shape.