| 摘要 |
PROBLEM TO BE SOLVED: To obtain a wide width aluminum alloy plate for super plastic forming and to integrally form a large formed body by subjecting rolled plates of super plastic aluminum alloy each other to solid-state welding. SOLUTION: Solid-state welding is a joining method not remaining a solidified structure to a joining part. It is preferable for solid-state welding to use friction agitation welding, flash butt welding, DC butt welding, resistance welding. A super plastic aluminum alloy is either of Al-Mg alloy, Al-Zn-Mg alloy, Al-Zn-Mg- Cu alloy, Al-Cu alloy, Al-Li alloy, Al-Mg-Si alloy, Al-Si alloy, etc., a recrystallization grain is refined, a grain size is preferably <=30μm. The material, refined by static recrytallization is subjected to a grain refining treatment to have a grain size of <=40μm, or a cold rolling of a draft of >=40% or softening annealing to a degree not generating recrsytallization in a process to produce a rolled plate. |
