Regensburg 2004 – scientific programme
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M: Metallphysik
M 30: Mechanische Eigenschaften V
M 30.4: Talk
Thursday, March 11, 2004, 15:30–15:45, H4
Propagation modes of Lüders and PLC bands in Cu-Al and Al-Mg during strain-rate and stress-rate controlled tensile deformation. — •Frank Klose1, Felix Hagemann1, Verena Grützun1, Peter Hähner2, and Hartmut Neuhäuser1 — 1TU Braunschweig, Institut für Metallphysik u. Nukleare Festkörperphysik, Mendelssohnstr. 3, 38106 Braunschweig — 2Institute for Energy, Joint Research Centre of the European Commission, PO Box 2, NL-1755 ZG Petten, Netherlands
Propagating plastic instabilities, like Lüders bands and Portevin-LeChâtelier (PLC) bands are investigated by means of laser scanning extensometry during tensile tests with different deformation modes (constant strain-rate and constant stress-rate).
This extensometry technique permits to investigate the kinetics of local strain within up to 44 zones (1 mm width) at a sampling rate of 50 Hz. Therefore, the band velocities and band widths, as well as the strain concentrations, characterizing the specific mode of band propagation, can be determined in relation to the type and quality of the deformation mode.
Cu-15at.%Al and Al-3at.%Mg polycrystals have been investigated experimentally at various temperatures and strain rates. The findings are compared with recent results of numerical simulations [1,2], focusing on fundamental differences observed with the above mentioned types of deformation mode.
[1] E. Rizzi et al., Acta Mater. 51(2003)3385
[2] P. Hähner et al., PRB 65(2002)134109