Abstract
The present investigation deals with the extrusion of aluminium powder preforms through square as well as wedge-shaped dies, at low reduction ratios and at different temperatures. The lack of coherency of the product extruded through both types of die is reported, and the effect of temperature and reduction ratio on the coherency is discussed. An attempt is made to correlate experimental observations relating to the coherency of the extruded product with analytical plots of velocity vectors, average-pressure contours and average effective strain-rate contours, obtained by using the finite-element method employing a velocity—pressure formulation. The influence of the dead-metal zone that arises during extrusion through square-edge dies is explained with the help of experimental as well as analytical studies.
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