Abstract
Most aluminium alloys are produced in complex shapes and hence it is important to investigate the effect of geometry on extrudability. Results of extrusion experiments which show that shape geometry appears to alter the relationship between the temperature-compensated strain rate and the hyperbolic sine stress function are presented. It is suggested that this anomaly is the result of inconsistencies in calculation of strain rate and temperature and a correction factor is proposed to relate extrusion experiments to a simple torsion test. It is shown that this correction factor can be related to the logarithm of a modified extrusion ratio. It is concluded that extruded structure, and hence some properties, may be predicted for shaped as well as rod extrudates.
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