Abstract
In this report, the influence of hot working on the cast structure of Al and some Al binary alloys refined by addition of small quantity of Ti with or without B was investigated. The results obtained were as follows: (a) The cast grain size grew according to the preheating of ingot before hot rolling, especially in 99.6% Al and Al-2.5% Mg, but the addition of grain refining element reduced the grain growth. (b) As in hot-rolled condition, both preheated and non-preheated materials, the grain size of rolled materials was relative to that of cast one; in other words, grain refining elements for cast structure refined the rolled structure as well as the cast structure. (c) When reheated after hot rolling, the grains were recrystalized and very fine grains were obtained, except in non-preheated Al-1.5% Mn alloy. In this case, the grain refiner for cast structure had less influence on the rolled structure.
