An Investigation of the Solubility of Scandium in Iron-Bearing Constituent Particles in Aluminium Alloys
Twelve different aluminium alloys with constant iron (Fe) and scandium (Sc) contents of 0.5 wt.% and 0.2 wt.%, respectively, were cast and subsequently homogenised. The distribution of Sc in the microstructure was examined by means of Energy Dispersive X-ray Spectroscopy (EDX) in Scanning Electron Microscope (SEM). Emphasis was put on measuring the solubility of Sc in the Fe-bearing phases of the investigated alloys. It was found that the amount of Sc tied up in Febearing phases is so low that it can be regarded as negligible, with the possible exception of α- AlFeMnSi (Al15(Fe,Mn)3Si2) and the π-phase (Al8FeMg3Si6). A quaternary AlFeSiSc phase with a composition close to Al10Fe3Si5Sc2 may have been discovered.
W.J. Poole, M.A. Wells and D.J. Lloyd
J. Røyset et al., "An Investigation of the Solubility of Scandium in Iron-Bearing Constituent Particles in Aluminium Alloys", Materials Science Forum, Vols. 519-521, pp. 531-536, 2006