True Stress-Strain Behavior of Al-based Cast Automotive Alloy Under Different Ageing Conditions and the Effect of Trace Zr

A thorough investigation has been carried out on the Al-12Si-1Mg-1Cu-1Ni automotive alloy considering different properties, specially mechanical properties associated with true stress and strain Zr addition of trace amount. commercially available piston is melted to produce alloy, amount added make another. The base along had applied homogenization, solution treatment, quenching, ageing in order get age-hardening response. alloys have heat-treated at 25 ºC, 200 300 respectively, for four hours attaining under, peak over-aged states, respectively. During ageing, Al2Cu Mg2Si phases are formed aluminium matrix leading peak-aged strength, which reduced state because coarsening precipitation recrystallizing, shown by tensile hardness properties. When Al3Zr appear while casting heat-treatment, resisting drop strength state. It visible stress-strain diagram that conditions, shows improved ductility. In micrographs finer distributed grains through grain refinement Zr, also prevents recrystallization conditions. homogeneity as a result addition's microstructural change was further confirmed fractography. clear adding such does not greatly increase their but it restrict declining preventing production thermally stable precipitates, coarsens behavior various intermetallics damaged alloy.