Prediction and Control of Subgrain Size in the Hot Extrusion of Aluminum Alloys with Feeder Plates
Xavier Velay and Terry Sheppard, Bournemouth University, Bournemouth, UK
Track: EXTRUSION/DIE, THEORETICAL - Microstructure
ABSTRACT --- It is widely recognized that subgrain size has significant
influence on the strength and ductility of metals. Modeling of subgrain size
evolution is essential for the detailed understanding and control of mechanical
properties. In the present paper, the evolutions of subgrain size during hot
extrusion of various aluminum alloys are first predicted. The microstructural
models are then applied to the extrusion of a thin, wide, semi-closed section
using a feeder plate. A feeder plate is investigated by comparing forward
extrusion with and without the plate. Results such as temperature, velocity
profile, microstructure, and pressure distribution are discussed. The influence of
the die configuration and the suitability of using several tuning parameters for
each alloy are also discussed.
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