Elemental aluminium, titanium and iron powders with compositions of Al90Ti10, Al55Ti45, Al65Ti25Fe10, respectively, were mechanically alloyed in a planetary ball mill. The sequence of phase formation was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). Various metastable phases were experimentally observed: supersaturated solid solution Al(Ti) for Al90Ti10, amorphous phase and L12-Al3Ti compound for Al55Ti45, amorphous phase and supersaturated solid solution Al(Ti,Fe) for Al65Ti25Fe10, and an fcc crystalline phase was inevitably found in those alloys. The formation of the fcc crystalline phase has been critically assessed. The results suggest that the fcc crystalline phase seems to be metastable and it cannot be solely attributed to the contamination from the milling atmosphere underthe present experimental conditions.
Iron Polymer Titanium Transmission Electron Microscopy Solid Solution
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