Zn-11.5%Al-1%Cu-0.02%Mg 合金の機械的性質に及ぼす熱処理の影響

抄録

  Effects of heat treatment and Cu, Al components, mass effect, mold type on the mechanical properties of Zn-Al foundry alloys were studied. Heat treatment at 360°C for 30 min, combined with an average transformation rate exceeding 370°C /min results in 20% improvement of tensile strength for as cast alloys. Tensile properties of alloys cast into graphite and metallic mold remain unchanged in as cast and heat treated alloys. Although decreasing Al content up to 8% results in 20∼30% lowering of tensile strength, increasing Al content up to 15% raises the tensile strength of heat treated alloys by 5∼10% . Cu addition of 3% cause an increase in tensile strength of alloys heat treated at 250∼300°C by 20∼35% . Cu content in 0.5∼3% do not change tensile strength for alloys heat treated at 360°C. With increasing sample weigth from 10g to 270g, tensile strength lowers 5∼20% and indicate mass effect in heat treatment.