Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
M: Metallphysik
M 48: Mechanische Eigenschaften IV
M 48.5: Vortrag
Dienstag, 8. März 2005, 17:30–17:45, TU H111
Investigations on the Portevin-LeChâtelier effect in Al-Mg metal-matrix composites — •Hanno Dierke1, Stephanie Graff2, and Hartmut Neuhäuser1 — 1TU Braunschweig, Inst. f. Metallphysik und Nukleare Festkörperphysik, D-38106 Braunschweig — 2Centre des Materiaux, Ecole Nationale Superieur des Mines de Paris, F-91000 Evry
Due to their low weight and high mechanical strength AlMg alloys provide a large variety of applications as material for lightweight construction. However, the practical benefit is limited due to instabilities and inhomogeneities caused by correlated movement of dislocations during plastic deformation (PLC effect). By addition of unshearable obstacles the formation of dislocation avalanches may be prevented or at least reduced.
The metal-matrix composite (MMC) AA5754 with 2 or 5 vol% Al2O3
showed hardly any influence of the particles added. This could be
explained by an inhomogeneous distribution of the particles during
manufacturing of this MMC.
Further investigations have been performed using AA6061 as matrix
material, as well as numerical modelling of the MMCs in cooperation with
the Ecole des Mines, Paris.