Warm compression and extrusion tests of aluminium

The effects of temperature and low strain rate on warm compression and extrusion of aluminium over a temperature range of 30–250 °C were experimentally investigated. For the compression and extrusion tests investigated, the respective true stress–true strain curves and the extrusion pressures were obtained that are empirically related by power-law and exponential-law equations, respectively. The ratio extrusion pressure/yield stress with die extrusion temperature is found to be higher for circular-shaped opening die than for square-shaped opening die of equal reduction in area. The effect of die temperature on the mechanical properties of extruded aluminium products is also presented.