Journal of Materials Science, Vol.35, No.16, 4073-4077, 2000
Prediction of dynamic recrystallization condition by deformation efficiency for Al 2024 composite reinforced with SiC particle
Hot torsion test has been carried out for Al 2024 composite reinforced with 8 mu m SiCp (15 vol.%) to suggest optimum hot working condition for dynamic recrystallization (DRX) at the temperature range of 320 to 520 degrees C and strain rate range of 0.1 to 3.0/sec. Flow curve and deformed microstructure have been analyzed to identify the hot restoration mechanism of DRX. Processing map showing the variation of the deformation efficiency expressed by [2m/(m + 1)], where m is the strain rate sensitivity, with temperature and strain rate has been described for the composite. The characteristics of domain of DRX and peak efficiency of the composite have been analyzed by observing deformed microstructure. The composite showed 40-50% efficiency at the DRX domain (370-460 degrees C, 0.1-0.5/sec). Also, the variation of deformation efficiency with Zener-Hollomon parameter (Z = (epsilon) over dot exp(Q/RT)) were discussed to find out optimum hot working condition for DRX of the composite. It is found that the optimum temperature and strain rate condition for DRX of the composite is 430-450 degrees C and 0.5/sec.