Abstract
Reflectal alloy (99.99% Al addded 0.5-2.0% Mg) is now widely used for reflector, jewellery, fittings etc. in every country.
It is well-known that this alloy is the non-heat-treatable one and has an excellent brightness after electrolytically polished and anodized. However, its hardness and tensile property are not enough for some special uses. The authors carried out the experiment on the heat-treatable Al-Mg-Si-Cu alloys (Mg-0.7%, Si-0.2, 0.3, 0.4% Cu-0.1, 0.3, 0.5, 1.0%) based on super-purity aluminium in order to find out improved mechanical properties without deterioration of reflectivity.
From this experiment, it was found out that Al-Mg (0.7%)-Si(0.3%)-Cu(0.4%) alloy has the best properties having 100-110 V. H. N., 80% of reflectivity and 28kg/mm2 of tensile strength in the T6 temper.
