الفهرس 
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Abstract
Rapidlly solidified ribbons of A1-16 wt.% Mn binary alloy and Al-16 wt.% Mn-Xwt.% Ti (X=2,4,6) ternary alloys have been produced by the twin roll technique then investigated.
Two rigs with two different rates of cooling were used for the binary Al-16 wt.% Nn. The first righas relatively low cooling rate (10 6 k/s) while the second rig has exceed this value.
The rapidly solidified structures of alloys and their decomposition behaviours were investigated by differential thermal analysis, X-ray diffraction analysis, scanning electron microscopy, energy dispersive X-ray analysis and microhardness test.
As for the binary alloy, by using relatively low cooling rate it was observed that the solid solubility of managanese in aluminium is extended up to 4 wt.% and the presence of quasicrystalline pgase while with using relatively high coolinf rate rig the solid solubility of managanese in aluminium is extended to about 16 wt.% Mn as a super saturated solid solution single phase.
For the ternary alloys, it was observed that there are two phases, a quasicrystalline phase and a super saturated solid solution -Al. Titanium was found to enhance the quasicrystalline phase, and thermally stabilize the rapidly solidified microstructure up to 500 C at 6 wt.% Ti.