Study on the aluminium-magnesium-silicon alloy (4th Report):Effect of the small addition of zirconium, iron, copper and cadmium on the mechanical properties and electrical conductivity of Al-Mg-Si ternary alloy
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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 alloy 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 alloy is slightly increased. But, iron does not give any effect on the enhancement of mechanical properties of the alloy after precipitation heat treatment.(3) Addition of copper increases the strength of Al-Mg-Si alloy 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 alloy 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 alloy 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.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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