抄録
The effect of Fe, Si, Cu and Mn upon the mechanical properties and the recrystallization phenomena of Al sheets which were cold-rolled (9) %) without annealing after hot-rolling was investigated. The results obtained are as follows: By addition of Fe the macro- and the micro-grains of ingots become considerably fine, moreover it lowers the recrystallization temperature and makes the recrystallized grain sizes finer with the rise of Fe contents. Si scarecely affects the above-mentioned properties up to 0.5%, but it lowers the recrystallization temperature above 0.5%. By the addition of Cu, the tensile strength and the hardness always increase with its contents, but it makes the recrystallized structure somewhat finer and lowers the recrystallization temperature. On the contrary, the addition of Mn exerts hardly any effect upon the mechanical properties but it raises the temperature for recrystallization and remarkably coarsens it’s grain size over 0.5%. The additon of Fe is most desirable for deep drawing manufacture of 2S sheets, because of its minimizing the developement of casting crack.
