Structural Comparison of Amorphous, Nanocrystalline and Microcrystalline Al90Fe7Nb3 Alloys

Abstract

This work presents the structural comparison of Al90Fe7Nb3alloys obtained by different techniques: (i) partly amorphous powder alloy produced by mechanical milling and their consolidation by hot extrusion (cylindrical bar), (ii) from millimeter portion by casting centrifuged system (square shape), and (iii) from millimeter portion by melt-spinning (ribbon shape). The cylindrical consolidated alloy presented an Al matrix with Al3Nb and Al13Fe4nanophases (intermetallic compounds), the square consolidated alloy resulted in the same structure composed of Al matrix with Al3Nb and Al13Fe4in micro-phase scale. On the other hand, the ribbon alloy exhibits an amorphous matrix with primary Al nanocrystals (fcc-Al phase).