Einfluss von SiC-Partikel und Gießgeschwindigkeit auf die Korngröße einer im Strangguss vergossenen Magnesiumlegierung AZ31

A. Schiffl, M. Easton

Publikation: Beitrag in FachzeitschriftArtikel


SiC particles are effective grain refiners in Mg-Al alloys. The greatest reduction in grain size occurs in alloys with low Al contents, and therefore the investigation has been undertaken with a commercial HP AZ31 Mg alloy. The presence of Mg2Si phases in the microstructure and consideration of phase equilibria suggest that SiC can transform into Al4C3. If this happens Al4C3 can also act as an effective grain refiner for Mg-Al alloys. The lattice misfit between SiC, Al4C3 and Mg is in the same range, about 4%. Good grain refining achieved in laboratory scale trials has been reproduced on an industrial scale vertical direct chill casting machine. The influence of the casting speed and the addition of SiC as grain refiner on the grain size across the cross-section of castings was investigated. A higher casting speed reduces the grain size at the edge of the casting of non-grain-refined billets, but the grain size is not consistent across the billet diameter. This variation in the grain size is not acceptable. After the addition of SiC grain refiner, the grain size was homogeneous across the casting crosssection.
FachzeitschriftBerg- und Hüttenmännische Monatshefte
PublikationsstatusVeröffentlicht - 2009

Research Field

  • Ehemaliges Research Field - Low Emission Transport

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