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1 Archives of Foundry Engineering

1 2010

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Analysis of heavy alloying elements segregation in gravity cast experimental Mg-Al-Zn-RE alloy

Żydek A., Polis-Olejniczak A., Malik M. A., Kamieniak J., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1

217-220

Microstructure of experimental AZ91 alloy with an addition of rare earth elements (RE) at a level of 4 wt.% was examined by means of light microscopy. The investigated AZ91 + 4 wt.% RE alloy was fabricated by adding cerium rich mish metal to molten commercial AZ91 alloy. In the microstructure of the resulting alloy, besides [alpha] solid solution, [alpha] + [gamma] eutectic and discontinuous precipitates of [gamma] phase, also the Al_11RE_3 phase with needle-like morphology and the polygonal Al_10RE_2Mn_7 phase were revealed. No segregation of rare earth elements was found in the investigated gravity cast alloy, which was confirmed by statistical analysis of cerium concentrations in selected parts of the cast. Similar results were obtained for manganese. Ce and Mn concentrations were determined by a spectrophotometric method.