Combating Al-Si porosity: the strontium hydrogen myth.

Modern CastingVol. 85 Nbr. 3, March 1995

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Aluminum-silicon

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Combating Al-Si porosity: the strontium hydrogen myth.

While strontium aggravates porosity, tests prove it isn't due to increased hydrogen. Maintaining rapid cooling minimizes porosity.

It is common practice for aluminum foundrymen to modify aluminum-silicon (Al-Si) alloys with strontium (Sr) to change the shape of the silicon and enhance the metal's mechanical properties. Unfortunately, Sr also tends to increase porosity in castings, sometimes to the p...

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