Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 40: Nanostructured Materials III

MM 40.1: Vortrag

Freitag, 31. März 2006, 11:00–11:15, IFW D

Compaction of Amorphous and Partially Crystallised Al-Ni-La Alloys — •Jens Vierke, Markus Wollgarten, and John Banhart — Hahn-Meitner-Institute, Materials Dep., Glienicker Str. 100, D-14109 Berlin, Germany

Morphology, microstructure and crystallisation behaviour of Argon (Ar) and Helium (He) atomised Al₈₇Ni₈La₅ and Al₈₅Ni₁₀La₅ alloy powders were studied by scanning and transmission electron microscopy, X-ray diffraction (XRD) and differential scanning calorimetry. XRD measurements of He-atomised Al₈₅Ni₁₀La₅ powders show a complete X-ray-amorphous structure. Ar-atomised powders of the same alloy exhibit fcc-Aluminium crystals in an amorphous matrix. In the case of Al₈₇Ni₈La₅, the microstructure consists of an amorphous phase, fcc-Aluminium as well as intermetallic phases. DSC measurements reveal that the amorphous phase of all alloys is stable up to a temperature of about 170^∘C, applying a heating rate of 20 K/min. The powders were compacted by uniaxial pressing, direct extrusion and equal channel angular pressing. Different compaction temperatures were applied with regard to the conservation of the amorphous phase. First results of the study will be presented. The support of the Institute of Materials and Machine Mechanics of the Slovak Academy of Sciences is gratefully acknowledged.