Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 35: Poster Session II
MM 35.8: Poster
Mittwoch, 25. März 2009, 16:30–18:30, P4
Primary Crystallisation in Al-rich Metallic Glasses at unusually low Temperatures — •Joachim Bokeloh1, Nancy Boucharat2, and Gerhard Wilde1 — 1Institut für Materialphysik, Westfälische Wilhelms-Universität Münster — 2Institut für Nanotechnologie, Forschungszentrum Karlsruhe
The initial stage of the primary crystallisation reaction and the glass transition of the marginal metallic glass Al-Y-Fe has been investigated in conventional and modulated DSC, microcalorimetry, XRD and TEM.
A sharp onset of the primary crystallisation was found in microcalorimetry and XRD studies at temperatures 120 K below the primary crystallisation peak observed in conventional DSC.
A systematic MDSC study of annealed samples revealed a wide spectrum of glass transition onsets which show a strong dependence on the annealing temperature and duration. In addition, the glass transition onsets can be linked to the initial stage primary crystallisation.
The observed spectrum of glass transition onsets may be interpreted as experimental evidence for a phase separation that precedes the nucleation and growth of aluminium nanocrystals in the respective al-rich metallic glasses.