Processing Map and Microstructure Evaluations of AA6061-Al2O3 Nanocomposite at Different Temperatures

Abstract

Hot compression behavior of Al6061/Al2O3nanocomposite was investigated in the temperature range of 350−500 °C and the strain rate range of 0.0005−0.5 s−1, in order to determine the optimum conditions for the hot workability of nanocomposite. The activation energy of 285 kJ/mol for the hot compression test is obtained by using hyperbolic sine function. By means of dynamicmaterial model (DMM) and the orresponding processing map, safe zone for the hot workability of AA6061/Al2O3is recognized at temperature of 450 °C and strain rate of 0.0005 s−1 and at temperature of 500 °C and the strain rate range of 0.0005−0.5 s−1, with the maximum power dissipation efficiency of 38%. Elongated and kinked grains are observed at 400 °C and strain rate of 0.5 s−1due to the severe deformation.