Abstract
Surface and subsurface areas of Direct Chill cast round ingots largely in AA 6063 were examined with metallographic and scanning electron microscope techniques. It is suggested that the surface (inverse) segregate layer, in relatively high quality low solute alloys, is the result of normal solute rejection ahead of a liquid/solid interface which, for the outer several hundred microns, is advancing TOWARDS the chill mould face. The traditionally accepted view of solidification beginning at the chill mould/metal interface and progressing directly to the interior is considered an unusual event in normal DC casting.
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References
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© 2016 The Minerals, Metals & Materials Society
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McCubbin, J.G. (2016). Inverse Solidification — A Theory of the Formation of the Surface on D.C. Cast Round Ingot. In: Grandfield, J.F., Eskin, D.G. (eds) Essential Readings in Light Metals. Springer, Cham. https://doi.org/10.1007/978-3-319-48228-6_96
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DOI: https://doi.org/10.1007/978-3-319-48228-6_96
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