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Morphological and microstructural characterization of aluminum alloy 7075 by correlative microscopy and digital process of images

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Pietro Carelli Reis de Oliveira Caltabiano
Total Authors: 1
Document type: Doctoral Thesis
Press: Guaratinguetá. 2017-01-12.
Institution: Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Guaratinguetá
Defense date:
Advisor: Luis Rogerio de Oliveira Hein; Peterson Luiz Ferrandini

Digital image processing and analysis tools were developed to perform the AA 7075 crystallographic and morphologic texture evaluation under different level of plastic deformation by uniaxial compression. Samples of AA 7075-T6 were submitted to full annealing process followed by uniaxial compression, thus obtaining deformations between 25 and 65% of thickness. The samples microstructure evaluation was performed considering: precipitates morphological parameters, crystallographic lattices reorientation and deformation substructure orientation. The characterization technics were: X-ray diffraction, electron microscopy, optical microscopy with polarization light, correlative microscopy and digital images processing. Xray diffraction results showed that the crystallographic plane (200) was reoriented to (220) after compression. The EDS analysis identified precipitates of Mg2Si, Al7Cu2Fe e Al6(FeCu). The precipitates morphological analysis showed an increase in fragmentation due to plane (331) at 39% of deformation. The digital image process of the samples etched with Barker reagents indicated a correlation between area fraction and the diffraction peaks, and the deformation substructures analysis made viable a qualitative characterization of the hardening process. (AU)

FAPESP's process: 11/00403-2 - Evaluation of precipitation hardening mechanisms in aluminum alloy by electron backscattering diffraction and digital image processing, under different cold pre-strain conditions
Grantee:Pietro Carelli Reis de Oliveira Caltabiano
Support Opportunities: Scholarships in Brazil - Doctorate