RENE RAMOS DE OLIVEIRA
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Artigo IPEN-doc 27815 The occurrence of a peripheral coarse grain zone (PCGZ) in extruded bars of AA 71082021 - SOUZA, SAUL H. de; PLAUT, RONALD L.; LIMA, NELSON B. de; OLIVEIRA, RENE R. de; PADILHA, ANGELO F.Industrial-scale extruded profiles of AA 7108 with a rectangular section (25.60 mm x 15.95 mm) were used in this investigation. Some complementary microstructural analysis techniques, such as polarized light microscopy, EBSD (Electron Backscatter Diffraction) and X-ray diffraction were used to characterize the microstructure, focusing on the PCG zone. It was observed that the extruded profiles presented a totally recrystallized microstructure and a 300 μm layer of peripheral coarse grains. Additionally, the results showed that the PCGZ predominant grain orientation {311} <110> differs from the texture below the PCGZ (Goss and Cube components).