Development of Al-Zn Die-Casting Alloys and Its Felxural Deformation Behavior

The present research goal is to manufacture the novel Al-x wt. % Zn die-casting alloys through liquid metallurgy route. The amount of Zn content was varied from 0 to 30. %with a step of 10 percentages in the pure Al,Thecast samples were squeezed under semi-solid condition (temperature ~500oC) and then all the samples were extruded at a temperature of 673k to achieve improved density of at least 95% and above. The microstructures of developed Al-Zn die-casting alloys were analysed using advanced electron microscope. The microstructures results revealed the formation of primary -Al phase and (+η) phase with η-agglomerates for higher amount of Zn content (greater than 20 wt. %). The consolidated Al-Zn alloys were mechanically tested by three-point ending test to examine the flexural behaviour of developed alloys. The flexural results explained that Al-20Zn alloy exhibited improved mechanical performance compared to other alloys. Maximum flexural strength of 196 MPa with the flexural strain of 7.48 was achieved in Al-20Zn alloy. Hence, Al-20Zn alloy is recommended to use for structural and automotive parts in real time application.