Recrystallization Behaviour in Twin-Roll Continuous Cast Al-Fe-Ni Alloy
Factors controlling the recrystallization of a continuous cast Al-Fe-Ni alloy were investigated by analyzing microstructure, grain structure, texture, and electron backscattering patterns. The texture of an as-rolled sample heated at 400°C was similar to that of a sample at the reduction ratio of 50% after intermediate annealing at 550°C. The as-rolled samples had a strong (213)[36-4] (S-type) orientation that was changed to a strong (130)[3-12] (QQ-type) orientation by heating at 400°C. This recrystallization looks like continuous recrystallization. Discontinuous recrystallization due to particle-stimulated nucleation is suppressed by the fine dispersion of Al-Fe-Ni-Si particles that form during casing and intermediate annealing, and stabilize the grain and subgrain structure. We think that a course initial grain structure and moderate level of strain level are the important factors promoting continuous recrystallization in this alloy.
W.J. Poole, M.A. Wells and D.J. Lloyd
A. Niikura, A. Kawahara, G. Kimura, T. Doko, "Recrystallization Behaviour in Twin-Roll Continuous Cast Al-Fe-Ni Alloy", Materials Science Forum, Vols. 519-521, pp. 1635-1640, 2006