The Effects Of Ageing Temperature On Tensile Properties And Fracture Behavior Of Al-6Si-0.5Mg Alloy Fabricated By Casting And Treated By T6 Heat Treatment

Abstract An Aluminum based in-situ alloy reinforced with Mg2Si and Si hard particles produced by casting Al-6Si-0.5Mg alloy. The microstructure tensile properties and fracture behavior of the alloy were investigated and the results show that the Mg2Si and Si hard particles produced by precipitation hardening have great effects. The homogenized 24hr at 500oC and solutionized 2hr at 540oC cast alloy was subjected to ageing treatment from room temperature to 300oC. The yield strength and fracture strength of the alloy increase with the increase of ageing temperature where as ductility and impact toughness decreases up to peakaged condition 1hr at 225oC. The microstructure of broken tensile specimen shows both the particle fracture and interface de-bonding affect the fracture behavior of the alloy.