Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 16: Microstructure and Phase Transformations I
MM 16.4: Vortrag
Montag, 26. März 2012, 16:30–16:45, H 1029
Effect of quenching rate on the clustering behavior of Al-Mg-Si alloys — •yong yan1, meng liu1,2, cynthia chang1, julian kühn1, and john banhart1,2 — 1Technische Universität Berlin, Materials Science and Technology, Hardenbergstr. 36, 10623 Berlin, Germany — 2Helmholtz Center Berlin for Materials and Energy, Applied Materials, Hahn-Meitner-Platz, 14109 Berlin, Germany
In order to investigate the effect of quenching rate on the clustering kinetics during natural aging (NA), high purity Al-Mg-Si alloys are quenched to different temperature and media. In-situ Positron Annihilation Lifetime Spectroscopy (PALS) and In-situ resistivity measurements at room temperature were then performed. It is found that four stages of changes in positron lifetime are directly observed. The quenching rate influences the first decrease of the lifetime during NA. The influence is larger for samples with lower solute content. On the other hand, a first decrease in the resistivity is observed in all alloys before the increase that is due to clustering of solute atoms. The amplitude of the decrease is more significant for samples with lower solute content and lower quenching rate. The first decrease in the positron lifetime and resistivity is discussed in terms of the interaction of vacancy and solute atoms.