| 摘要 |
PURPOSE:To obtain a superplastic Al alloy having excellent corrosion resistance by subjecting a specifically composed Al-Zn-Mg alloy to a homogenization treatment to form a core material and cladding the same with a specifically composed Al-Zn alloy as a skin material then subjecting the material to cold rolling. CONSTITUTION:The Al-Zn-Mg alloy which contains Zn and Mg at specific %, contains 1 or >=2 kinds selected from specific % Cu, Mn, Cr, Zr, V and Ti and consists of the balance Al and impurities is subjected to the homogenization treatment to form the core material. The Al-Zn alloy which contains Zn at specific %, contains further 1 or >=2 kinds selected from specific % Mg, Cu, Mn, Cr, Zr and Ti and consists of the balance Al and impurities is used as the skin material. Such core material and skin material are subjected to hot rolling to form the clad material which is then subjected to one or two stages of heating and holding at a specific temp. and to cooling at a specific temp. The clad material is then subjected to at least >=30% cold rolling or >=1 times of 20-60% cold rolling. |
