Method of Adding Alloy Additions in Melting Aluminum Base Alloys for Ingot Casting.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A method is disclosed of adding alloying elements, including highly reactive metals such as lithium, to molten aluminum so that the normally occurring oxidation reaction of such elements with the atmosphere is minimized. After adding all alloying elements, except the highly reactive metals, to the molten aluminum, and after the alloyed melt has been subjected to a degassing and filtering process, the reactive metals are introduced in a mixing crucible as the final step prior to the casting operation. The desired concentration of reactive metal in the melt is achieved by controlling the relative amounts of reactive metal and alloyed melt. Uniformity of the mixture is controlled by mechanical stirring. The alloyed metal is then cast into ingots. Author
- Metallurgy and Metallography
- Fabrication Metallurgy