한국주조공학회

The microstructures of self-designed 7000 series Aluminium alloys added with Sc are observed. Moreover, the mechanical properties of the Sc-added Aluminium alloys are evaluated as a function of tensile temperature to establish the conditions of a following extrusion process. New casting conditions in the aluminium alloys added with Sc could be established by changing the casting speed and stirring time in the existing casting conditions of Aluminium alloys. The Sc addition results in Al3(Sc,Zr) precipitates in the cast alloys, and leads to the formation of equal-axed grains and fine grains. After homogenization heat treatment at 450oC, the Sc-added Aluminium alloys showed the highest elongation values in the temperature ranging from 300~400oC.

7000 series Al alloy, Sc addition, Casting, Mechanical properties, Elongation.