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Phase selection in undercooled quasicrystal-forming Al-Mn alloy melts.

Small droplets in size of 20-1000 μm of Al-Mn alloys have been undercooled by containerless solidification during free fall in a drop tube or by melt atomization. The as-solidified droplets were analyzed with respect to the phases formed from the undercooled melt by electron microscopy, x-ray diffraction, and differential thermal analysis. Depending on the droplet size, various phases have been identified ranging from supersaturated Al SS , intermetallic Al 6 Mn, to quasicrystalline phases