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- Title
CARACTERIZACIÓN DE UNA ALEACIÓN AA7075-HOMOGENEIZADA Y LAMINADA A 50 Y 85%.
- Authors
del V. Valera, M.; Luiggi, N. J.; Prin, J. L.; Linares, M. G.; MacLellan, L. E.
- Abstract
AA7075 alloy was characterized using the techniques of Differential Scanning Calorimetry (DSC), Electrical Resistivity (?) and Transmission Electron Microscopy (TEM) for samples homogenized and deformed by rolling at different degree of reduction in thickness. The results show for each of the techniques used a microstructural variation between the homogenized and rolled samples. Are evident in the homogenized samples, both DSC and resistivity measures, reactions associated with the precipitation of GP zones, of the ? phase and phases possibly rich in Cu at temperatures above 500°C coincident with those reported in the literature. DSC measures insinuate also the precipitation of the phase ?' at 175°C. The rolling effect is to move each of the reactions that occur below 400°C, demonstrating a clear interaction between the processes of precipitation and recrystallization. In this sense we conclude that the initial rearrangement of dislocations, or restoration, affect precipitation of GP zones, while the recrystallization interacts with the precipitation of phases ? 'and ?, showing both a single reaction exothermic for DSC and ? measurements. The process of total recrystallization of the samples occurs at temperatures below 400°C. Above that temperature all samples show similar behavior. TEM measurements permit verify all these statements, showing microstructures with an increasing density of dislocations to the extent that the degree of laminate increases. At first disordered, forming tangles of dislocations, and then arranging on parallel form about the grain boundaries. Therefore, the DSC measurements, ? and METreveal the interaction between the precipitation and relaxation of the microstructure processes by recrystallization of plastically deformed samples.
- Publication
Acta Microscopica, 2013, Vol 22, Issue 1, p111
- ISSN
0798-4545
- Publication type
Article