Abstract: Effect of ageing on the mechanical properties of wrought Al-6Mg alloy with ternary scandium and quaternary zirconium and titanium is made. The results show that the influence of scandium is much pronounced on yield strength than on the tensile strength. The quaternary additions have negligible effect on the yield strength of the alloys. Elongation increases because of the fact that subgrains cannot coarsen so much. Strain hardening exponent ‘n’ values are found to comparatively low at higher ageing temperature. The room temperature values of strain rate sensitivity ‘m’ are comparatively high and hints upon its superplastic behaviour at elevated temperatures. The fracture of the experimental alloys occurs through microvoid coalescence.
 
Key words: Age hardening, precipitates, strain hardening exponent, strain rate sensitivity, microvoid.

Cite: M. S. Kaiser, "Tensile and Fracture Behavior of Wrought Al-6Mg Alloy with Ternary Scandium and Quaternary Zirconium and Titanium Addition," International Journal of Materials Science and Engineering, Vol. 3, No. 2, pp. 147-158, June 2015. doi: 10.17706/ijmse.2015.3.2.147-158