Puchi Cabrera, Eli Saul (1983) Effect of the deformation history on the recrystallisation kinetics of Al-1%Mg alloy. PhD thesis, University of Sheffield.
Abstract
The literature concerning the industrial hot rolling of commercial aluminium alloys and the structural modifications that take place throughout the operations of such processes has been reviewed. Particular attention has been given to the static restoration processes that occur during the time intervals between deformations of non-heat treatable commercial alloys. Experimental and predictive methods of analysis of strain and temperature distributions developed during deformation under plane strain compression conditions have also been surveyed. Single and multiple deformation tests were performed on specimens of commercial-purity aluminium, A1-l%Mg and A1-l%Mg-l%Mn alloy using a plane strain compression testing machine operated by computercontrolled servohydraulic systems, with furnaces and quenching facilities. Basic stress-strain data derived from such tests in the range 300-500°C and 1-100 s * were used in conjunction with the appropriate model to describe previous deformation history, in the simulation of hot rolling operations carried out on these materials both on laboratory and industrial scales. However, such a model required knowledge of the functional dependence of the time to a fixed recrystallised fraction and the recrystallised grain size, on variables such as: strain, strain rate, temperature and initial grain size, which was achieved by means of restoration and recrystallisation experiments after one deformation. Also, restoration studies carried out after two deformations allowed the investigation of the effect of the presence of recrystallisation between the first two deformations on the kinetics of recrystallisation and the recrystalisation-restoration relationship during the interpass interval between second and third deformations. Recrystallisation of the individual fractions with different accumulated strains seems to take place independently of each other. Reasonable agreement has been obtained between the computer predicted load trend and the one found experimentally during the industrial hot rolling of commercial-purity aluminium and Al-l%Mg alloy.
Metadata
Awarding institution: | University of Sheffield |
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Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) |
Academic unit: | Department of Metallurgy |
Identification Number/EthosID: | uk.bl.ethos.394687 |
Depositing User: | EThOS Import Sheffield |
Date Deposited: | 12 Oct 2023 11:15 |
Last Modified: | 12 Oct 2023 11:15 |
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