Details

Autor(en) / Beteiligte

• Hidalgo-Manrique, P.
• Cepeda-Jiménez, C.M.
• Orozco-Caballero, A.
• Ruano, O.A.
• Carreño, F.

Titel

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

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2014-06, Vol.606, p.434-442

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.