Hideji Suzuki and Susumu Ikeda
By means of the same method as in the case of the first report, the rate of growth of a recrystallized crystal was measured for six kinds of Al-Cu alloys, containing 0.027, 0.15, 0.56, 1.03, 1.61 and 2.00% Cu, respectively. The results differ from those of pure aluminium in the following points: (1) The more the copper content is the slower the growth-rate at a higher temperature than a certain characteristic temperature, but the reverse at the lower, provided that the copper content is more than about 0.03%. (2) An increase in copper content results in the depression of the transition temperature, at which the driving force changes its functional form from (l+c)/D or l/D in the case of the copper content being less than about 0.6% (3) The Rate of growth in alloys containing 1.61 or 2.00% Cu, pre-annealed at 350° is far slower than those pre-annealed at 450°, that is, the rate of growth is decreased by the process of dissolution of precipitates.
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