Matéria (Rio de Janeiro)
On-line version ISSN 1517-7076
CARDOSO, E. K. et al. Microstructural evolution of AA7050 al alloy processed by ECAP. Matéria (Rio J.) [online]. 2010, vol.15, n.2, pp. 291-298. ISSN 1517-7076. http://dx.doi.org/10.1590/S1517-70762010000200029.
This work aimed to study the microstructural evolution of commercial aluminum alloy AA7050 in the solution treated condition (W) processed by equal channel angular pressing - ECAP. The analyses were made considering the effects of process parameters as temperature (Tamb and 150°C), processing route (A and BC) and number of passes. Optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used for microstructural characterization, and hardness tests for a preliminary assessment of mechanical properties. The results show that the refining of the microstructure by ECAP occurred by the formation of deformation bands, with the formation of dislocations cells and subgrains within these bands. The increase of the ECAP temperature led to the formation of more defined subgrains contours and intense precipitation of η phase in the form of spherical particles. The samples processed by Route BC present a more refined microstructure.
Keywords : aluminum alloy; ECAP; microstructure.