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A combined theoretical and experimental study of recrystallization in AA7050.
Robson, J. D.; Prangnell, P. B
In: Advances in the Metallurgy of Aluminum Alloys, Proceedings from Materials Solutions Conference, the James T. Staley Honorary Symposium on Aluminum Alloys, Indianapolis, IN, United States, Nov. 5-8, 20; 2001.
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Abstract
The partially recrystd. structures formed during soln. treatment of Al alloy AA 7050 were investigated by optical microscopy and electron backscattered diffraction. The Al3Zr dispersoids which form during homogenization of AA 7050 were inhomogeneously distributed within each grain. During soln. treatment, significant subgrain recovery occurred and partial recrystn. took place by particle stimulated nucleation in regions close to the grain boundaries. A phys. model was developed to predict the fraction of recrystn. The predicted fractions agreed well with the measured fractions. The dispersoid distribution could be improved by slow heating to the homogenization temp. The subgrain size after rolling could also have a large effect on the recrystd. fraction. The model suggests that minimization of the recrystn. fraction requires a combination of high av. Zr level, slow heating to the homogenization temp., and a rolling practice that gives a large subgrain size. Further results are discussed in detail. [on SciFinder (R)]
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