Abstract
It is well known that when Zr is added to aluminium and its alloys, the recrystallization temperature is elevated.
This is a report on the study concerning the effect of Zr to the relation of recrystallization temperature and impurities or alloying elements in aluminium and also on the effect of Zr to the mechanical properties and heat resistance of aluminium as well as Al-Cu base alloys.
Findings are as follows:
1) The higher the purity of the metal, the more remarkable the elevation of recrystalization temperature is.
2) Si as an impurity in aluminium spoil the effect of Zr, while Fe does not.
3) The effect of Zr to the mechanical properties of aluminium and Al-Cu alloys is that the tensile strength of the metal in crease at room as well as the elevated temperature, but in this case Cu content must be less than 2%.
