Amorphous and Nanostructured Al-Fe and Al-Ni Based Alloys

F. AUDEBERT

Properties and Applications of Nano-crystalline Alloys from Amorphous Precursors”; Series: NATO Science Series II: Mathematics, Physics and Chemistry

Kluwer Acad. Publishers

Lugar: Dordrecht; Año: 2005; p. 301 - 312

Al-based systems allow obtaining microstructures composed of different combinationof several classes of phases: crystalline solid solutions, amorphous solid solutions,crystalline intermetallic compounds and quasicrystals. Many Al-Fe based systems areicosahedral phase formers, but non icosahedral phase was reported in Al-Ni basedsystems. The strong hetero-atomic interaction in the liquid of Al-based alloys appearsto have a big effect on the amorphous forming ability. In order to analyse theamorphous forming ability and the amorphous structure of Al-Fe and Al-Ni basedalloys, series of samples were produced by melt spinning. The structure wascharacterised by means of X-ray diffraction, Mössbauer spectroscopy andtransmission electron microscopy. Clusters with medium range order in the Al-Febased alloys were found and the icosahedral short range order in the amorphousstructure is discussed. These alloys have a heterogeneous amorphous structure atnano-scale. The relationship among the different phases obtained by rapidsolidification in the Al-Fe based systems is discussed considering the hetero-atomicinteraction and the ability for clusters formation in the liquid.