Nanostructured Al-MM-Ni-(Fe,Co) Alloys Produced by Devitrification

J. LATUCH; H. DIMITROV; F. AUDEBERT; T. KULIK

Solid State Phenomena

Trans Tech Publications

Lugar: Switzerland; Año: 2003 vol. 94 p. 71 - 74

1012-0394

Amorphous and nanocrystalline structures can easily be obtained in quaternary systems, containing Al, lanthanide metal (Ln) and two late transition metals. Replacement of Ln by Mischmetal (Mm) reduces the cost of the materials studied, as Mm is several times cheaper that pure lanthanide elements. Fully amorphous ribbons of Al-Mm-Ni-(Fe,Co) alloys, containing 4 and 5 at.% of Mm, were produced by the melt-spinning technique. Structures, consisting of nanoparticles, embedded in amorphous matrix were obtained by additional isothermal annealing of the initially fully amorphous alloys. X-ray diffractometry, transmission electron microscopy and differential scanning calorimetry were used for characterisation of the crystallization process and its products. It was found that the replacement of Al by Mm increases the thermal stability of the alloys. Isothermal annealing was found to be an effective method for producing a new group of nanocrystalline Al-based alloys.