Abstract
In as much as the recrystallisation is the main factor of abnormal grain-growth of industrial aluminium alloys, the recrystallisation phenomena of pure aluminium were investigated in detail. Although some of recrystallisation diagram of pure aluminium have been reported, the type of the diagrams differs from each other. In chapter I are discussed factors which can affect recrystallisation, and a new diagram is constructed by the result of heating in salt bath of 0-10% deformed aluminium plates. If determined conditions were satisfactory, the diagram can be reproduced at will. This diagram shows that, the higher the heating temperature the finer the recrystallised grain size with specimens of same degree of deformation. This relation gives an account on the process of formation of new grains during recrystallisation. In chapter II are treated the problems of grain-growth which occurs after recrystallisation. This occurs generally in specimens which were subjected to a large degree of deformation and at high temperature. The author concluded that this phenomenon is induced by mutual relation between the difference in potential energy of neighbouring crystals and inter crystalline diaphram of impurity contained.
