Evolution of the microstructure, texture and creep properties of the 7075 aluminium alloy during hot accumulative roll bonding

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 th...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-06, Vol.606, p.434-442
Main Authors: Hidalgo-Manrique, P., Cepeda-Jiménez, C.M., Orozco-Caballero, A., Ruano, O.A., Carreño, F.
Format: Article
Language:English
Subjects:
7075 Aluminium alloy
Accumulative roll bonding
Aluminum base alloys
Annealing
Applied sciences
Boundaries
Cold working, work hardening
annealing, quenching, tempering, recovery, and recrystallization
textures
Creep
Cross-disciplinary physics: materials science
rheology
Discontinuous recrystallisation
Exact sciences and technology
Grain boundary sliding
Heat treatment
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Misorientation
Other heat and thermomechanical treatments
Physics
Production techniques
Recrystallization
Roll bonding
Superplasticity
Surface layer
Texture
Treatment of materials and its effects on microstructure and properties
Zener drag
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Summary: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 440nm 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 3×10−3–10−2s−1. Boundary misorientation and thermal stability are the two main factors that contribute to high elongations to failure.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.03.105