Thermally induced phase transformations of Al93Fe4Nb3 and Al90Fe7Nb3 quenched alloys

Abstract

Abstract Al–based rapidly quenched alloys of composition Al90Fe7Nb3 and Al93Fe4Nb3 were studied by Mӧssbauer spectroscopy, X–ray powder diffraction and differential scanning calorimetry methods. The occurrence of thermally induced phase transformations has been established. It is shown that both ribbons reveal the structure in which Fe–atoms have an aluminum ones neighbors both in amorphous and annealed up to 653 K that corresponds to the atomic arrangement in Al6Fe metastable phase. At higher than 709.6 K annealing temperatures the structural transformations of this phase into mix of stable Al13Fe4 compound and aluminium were observed and at 893 K these transformations were completed.