Determining the Effect of Bi-Sr Interactions on Si Morphology in 319 Al.

Modern Casting | June 1, 2000| | Copyright

Through experimental data, this article details the Sr/Bi ratio required to effectively modify Si morphology in 319 aluminum and improve melt quality and casting grain structure.

Several elements have been found to refine the size and morphology of eutectic silicon (Si) in hypoeutectic aluminum alloys. This refinement (or modification of the eutectic Si) is defined as a change in the morphology of the eutectic Si from a coarse plate (acicular) to lamellar or fibrous morphologies of varying degrees. For many years, strontium (Sr) has been the most popular choice by ...

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