Abstract
Anisotropy in the tensile yield stress and serration intensity of a direct chill cast (DC) and a strip cast (SC) Al-4.5Mg alloy have been compared. The materials were tested in the hot band (hot rolled) condition and after solution treatment. Anisotropy was most marked in the as hot rolled SC material, the lowest yield stress being found at 45° to the rolling direction; a lower level of anisotropy occurred in the thicker (4.5 mm) DC hot band. In both these materials, the stress drop was smallest in the rolling direction and largest at 90° to the rolling direction. The solution treated SC hot band and the thinner (2.6 mm) DC hot band, both of which had undergone recrystallisation, exhibited little anisotropy in either yield stress or stress drop. The results are discussed in terms of the observed microstructure and grain morphology.
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