Regensburg 2007 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 10: Liquid and amorphous materials IV
MM 10.5: Talk
Monday, March 26, 2007, 17:15–17:30, H4
Nanocrystallisation of amorphous Al85Ni10La5 powder induced by severe plastic deformation — •Jens Vierke1, Vitaly Pilyugin2, Ingwer Denks1, Nelia Wanderka1, Markus Wollgarten1, and John Bahnhart1 — 1Hahn-Meitner-Institute Berlin, Glienicker Str. 100, 14109 Berlin, Germany — 2Russian Academy of Sciences, Institute of Metal Physics, Kovalevray street 18, 620219 Yekaterinburg, Russia
The nanocrystallisation behaviour of Helium-atomised amorphous Al85Ni10La5 powder subjected to high pressure torsion (HPT) at room temperature and thermal treatments have been studied by differential scanning calorimetry (DSC), wave- and energy-dispersive X-ray diffraction and scanning and transmission electron microscopy. DSC experiments combined with X-ray diffraction analysis show a joint precipitation of α-Aluminium and intermetallic phases at an onset temperature of 276°C, using a heating rate of 40 °C/min. On the contrary, a primary precipitation of α-Aluminium was observed in powders which were deformed by HPT at room temperature. X-ray diffraction analysis of HPT-discs shows that a rising shear deformation leads to a growing number of Al-nanocrystals in the amorphous matrix. The presented results are discussed regarding the development of the microstructure during the consolidation of this powder.