Abstract
This is to report on the study of the effect of the small addition of zirconium, iron, copper and cadmium on the mechanical properties and electrical conductivity of Al-Mg-Si ternary alloys with different Mg/Si weight ratio.The findings are summed up as follows:(1) The addition of zirconium gives the largest effect of all the additive elements on the increase in strength of Al-Mg-Si asextruded. When the specimens containing zirconium are extruded and treated by the precipitation heat treatment at 230°C for 2 hours, the following mecanical properties and electrical conductivity can be easily obtainedConductivity; (% IACS at 20°C) 57%Ultimate tensile strength; 22kg/mm2Tensile yield strength; 17kg/mm2(2) By the addition of iron, the strength of as-extruded Al-Mg-Si is slightly increased. But, iron does not give any effect on the enhancement of mechanical properties of the after precipitation heat treatment.(3) Addition of copper increases the strength of Al-Mg-Si after precipitation heat treatment and the decrease in electirical conductivity is comparatively small.Only after precipitation treatment, excess silicon alloy containing 0.2-0.4% of copper shows the following values of mechanical properties and electrical conductivity: Conductivity; (IACS at 20°C) 58-56%Ultimate tensile strength 22-25kg/mm2Tensile yield strength; 17-20kg/mm2From this experiment, it is found that the Al-Mg-Si containing small amount of copper is quite suitable for electric conductor, if the environment is not so corrosive.(4) Addition of cadmium increases the mechanical properties of Al-Mg-Si after solution and precipitation heat treatment. But in case the T-5 treatment is given to the metal, such effect is not so remarkable as in the case of the addition of copper.
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