| 摘要 |
PURPOSE:To obtain an Al alloy for a casting which is provided with high toughness and superior tensile strength by short-time heat treatment by adding restricted amounts of Si, Mg and Sb to Al. CONSTITUTION:This Al alloy for a casting consists of 4-6% Si, 0.3-0.6% Mg, 0.05-0.2% Sb and the balance Al with inevitable impurities or further contains <=0.2% Ti and 0.005-0.05% Sn. The Al alloy shows higher toughness than a conventional Na treated alloy because Sb is contained. The Al alloy is provided with high toughness by heat treatment at a low temp. without reducing the strength, so the heat treatment time can be shortened and the cost of products can be reduced.
|
