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Erschienen in:
2016 | OriginalPaper | Buchkapitel
A Draft Melting Procedure for Al Alloys
verfasst von : J. Campbell
Erschienen in: Shape Casting: 5th International Symposium 2014
Verlag: Springer International Publishing
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Current melting practices for Al alloys are in general unsatisfactory because it is clear that properties of Al alloy castings are not under control. In particular the variability of tensile ductility appears to indicate the great variability of oxide bifilm contents. A melting and casting procedure is outlined in which (i) the primary oxide skins from the surface of charge materials are first separated from the melt, followed by (ii) procedures for reducing the population of oxide bifilms in suspension from the interiors of charge materials, (iii) Hydrogen gas is reduced passively, avoiding potentially damaging bubbling techniques. (iv) Finally, techniques for the transfer of good quality metal into molds without re-introduction of damage are briefly mentioned.