Berlin 2012 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 3: Topical Session Bulk Nanostrucured Materials I - Processing
MM 3.3: Talk
Monday, March 26, 2012, 11:00–11:15, H 0107
Cu(Bi) alloys processed by Dynamic plastic deformation — •Henning Edelhoff1, Harald Rösner1, Matthias Wegner1, Boris Straumal2, Zhenbo Wang3, Ke Lu3, Sergij Divinski1, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Münster, Germany — 2Institute of Solid State Physics, Chernogolovka, Russia — 3Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, China
Due to the increased interest in improved materials properties by microstructural refinement numerous synthetic techniques have been developed. One special method of plastic deformation, is the so-called dynamic plastic deformation (DPD) conducted at cryogenic temperatures and high strain rates leading to nanostructured materials. In the case of pure copper, alongside to grain refinement, an increasing tendency of deformation twinning is observed [1]. In this work, the DPD technique is used to deform copper-bismuth alloys with 200 and 1200 ppm bismuth, respectively. The ultrafine grained samples produced by DPD were examined by means of X-ray diffraction analysis, transmission electron microscopy and scanning electron microscopy combined with electron back scatter diffraction. The influence of bismuth on the microstructural refinement was investigated, following a special interest in segregation of bismuth at deformation twin boundaries.
[1] Y.S. Li, N.R. Tao, K. Lu, Acta Mater, 56, 230 (2008)