“…[5,6,9,10,[13][14][15][16][17][18][19][20][21] The kind of the alumina formed depends on the temperature, at which the reduction takes place. Besides the thermodynamically stable corundum, metastable alumina phases like g-, h-, or d-Al 2 O 3 can be formed at temperatures below 1 000 C. [13,17,19,21] If the aluminum melt contains magnesium, the magnesium aluminate spinel MgAl 2 O 4 , [7] magnesium titanate MgTiO 3 , [14,15] or magnesium dititanate MgTi 2 O 5 [8] form additionally. For aluminum alloys containing a high amount of silicon, formation of the intermetallic phases like (Al,Si) 3 Ti, Al 60 Si 12 Ti 28 , [17,20] or Ti 7 Al 5 Si 12 [14] has been reported.…”