HOT WORKABILITY CHARACTERISTICS OF 7075 Al/10% SiCp COMPOSITES
Keywords:
Hot Working Composites, Processing Map, Dynamic RecrystallizationAbstract
An important parameter in the mechanical working of materials is called workability, which is the relative ease with which a metal can be shaped through plastic deformation without the formation of any defect. Workability can be evaluated by means of processing maps, constructed from experimentally generated flow stress variation with respect to strain, strain rate and temperature. The present work is generating processing maps for hot working processes for 7075 Al/10% SiCp composite in the temperature range of 300 to 500 °C and strain rate range of 0.001 to 1 s-1. The processing map exhibits a safe domain of dynamic recrystallization (DRX) with a peak efficiency of power dissipation of about 24% at 400 °C and strain rate of 0. 1s-1. Flow instability occurs due to adiabatic shear bands and flow localizations at higher strain rates above 0.1 s-1 and the corresponding processing conditions are avoided. The safe domains and unsafe domains were validated through microstructural investigations.
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References
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