抄録
The effects of magnesium and of heat-treatments were investigated upon the hardness and the strength of high tensile silumin, such as Al-Si-Mg alloy containing Sn-Sb, Sb-Cd, Cu-Sb, Cu-Cd, or Mn-Cu-Sb.
These alloys containing 0.3-1.0% Mg were tempered for 2.5-160 hours at 140-220°. The maximum hardness and strength were obtained in alloys containing 0.75% Mg quenched at 510° after held for 6 hours at that temperature and tempered for 2.5 hours at 180°. When Al-Si-Mg-Cu-Sb alloy was tempered at 180°, three distinct maxima appeared in hardness curves.
