Microstructural study of the interface reaction between titania whiskers and aluminum

Combustion synthesis and development of Ti–O–C aluminium composites

“…If it accumulates and forms larger clusters, numerous voids are created inside them. This is similar as in [23], where during the reaction of TiO and Al with ␥-Al 2 O 3 , ␣-Al 2 O 3 was formed and porosity in the obtained composite reached 10-15%.…”

Microstructural evolution of reactive-sintered aluminum matrix composites

“…3c, a small amount of c-Al 2 O 3 seemed to be produced at 1073 K. The formation of c-Al 2 O 3 phase is still the consequence of the above aluminothermic reactions. Pan et al [14] also observed the existence of fine c-Al 2 O 3 particles (60-70 nm) by high resolution transmission electron microscope. Nanosized particles were formed by interfacial reaction between TiO 2 and Al.…”

Formation of Corundum, Magnesium Titanate, and Titanium(III) Oxide at the Interface between Rutile and Molten Al or AlSi7Mg0.6 Alloy

“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] As products of the reduction process, titanium suboxides like Ti 3 O 5 , Ti 2 O 3 , TiO, and concurrently released metallic titanium were reported. [9,10,12,17,19,21] Ti is initially dissolved in the melt. However, when its concentration in the melt exceeds the solubility limit, intermetallic phases like TiAl 3 , TiAl 2 , TiAl, or Ti 3 Al are formed.…”

“…However, when its concentration in the melt exceeds the solubility limit, intermetallic phases like TiAl 3 , TiAl 2 , TiAl, or Ti 3 Al are formed. [5,6,9,10,[13][14][15][16][17][18][19][20][21] Titanium dissolved in the Al melt is incorporated into the face-centered cubic Al lattice during solidification. [9][10][11]13] Oxygen from reduced TiO 2 forms Al 2 O 3 with Al from the melt.…”

“…[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.…”