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Título: | Evolution of the microstructure, texture and creep properties of the 7075 aluminium alloy during hot accumulative roll bonding |
Autor: | Hidalgo-Manrique, P.; Cepeda-Jiménez, C.M. CSIC ORCID ; Orozco-Caballero, A. CSIC ORCID; Ruano, Oscar Antonio CSIC ORCID; Carreño, Fernando CSIC ORCID | Palabras clave: | Accumulative roll bonding 7075 Aluminium alloy Discontinuous recrystallisation Zener drag Grain boundary sliding Superplasticity |
Fecha de publicación: | 12-jun-2014 | Editor: | Elsevier | Citación: | Materials Science and Engineering A 606 : 434-442 (2014) | Resumen: | The 7075 Al alloy was severely deformed at 350 °C by a 3:1 thickness reduction per pass accumulative roll bonding (ARB) process up to six passes. It was found that discontinuous recrystallisation occurs during the inter-pass annealing stages from the third pass on, attributable to the increment of the mean particle size during processing. As a consequence, the mean crystallite size did not decrease, but remained approximately constant at 440 nm along the present ARB process and the mean boundary misorientation angle reached a maximum of 30° for the 3-passes sample. However, since nucleation of new grains takes place at the pre-existing grain boundaries, discontinuous recrystallisation results in slight changes in texture throughout the processing, being the orientations in the ARBed samples predominantly located along the typical rolling β-fibre. Uniaxial tests conducted at 300 °C and 350 °C revealed that the operating deformation mechanism in the processed alloy at such temperatures was grain boundary sliding; the optimum superplastic strain rate being 3×10−3–10−2 s−1. Boundary misorientation and thermal stability are the two main factors that contribute to high elongations to failure | Versión del editor: | http://dx.doi.org/10.1016/j.msea.2014.03.105 | URI: | http://hdl.handle.net/10261/110234 | DOI: | 10.1016/j.msea.2014.03.105 | ISSN: | 0921-5093 |
Aparece en las colecciones: | (CENIM) Artículos |
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Mater Sci Eng A, 2014.pdf | 1,67 MB | Adobe PDF | Visualizar/Abrir |
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