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Title: | Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy |
Authors: | Huang, Y Jiang, J |
Keywords: | severe plastic deformation (SPD);ultrafine grain structure;cryogenic temperature;dynamic restoration;grain boundary dislocation |
Issue Date: | 13-Nov-2021 |
Publisher: | MDPI AG |
Citation: | Huang, Y. and Jiang, J. (2021) 'Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy', Metals, 11 (11), 1822, pp. 1 - 14 (14). doi: 10.3390/met11111822. |
Abstract: | Copyright: © 2021 by the authors. The deformation structures formed in an Al-0.1Mg single-phase aluminium alloy have been studied during plane strain compression (PSC) down to liquid nitrogen temperature, following prior equal channel angular extrusion (ECAE) to a strain of ten. Under constant deformation conditions a steady state was approached irrespective of the temperature, where the rate of grain refinement stagnated and a minimum grain size was reached which could not be further reduced. A 98% reduction at −200 °C only transformed the ECAE processed submicron grain structure into a microstructure with thin ribbon grains, where a nanoscale high angle boundary (HAB) spacing was only approached in the sheet normal direction. It is shown that the minimum grain size achievable in severe deformation processing is controlled by a balance between the rate of compression of the HAB structure and dynamic recovery. The required boundary migration rate to maintain a constant boundary spacing is found far higher than can be justified from conventional diffusion-controlled grain growth and at low temperatures, a constant boundary spacing can only be maintained by invoking an athermal mechanism and is considered to be dominated by the operation of grain boundary dislocations. |
URI: | https://bura.brunel.ac.uk/handle/2438/23497 |
DOI: | https://doi.org/10.3390/met11111822 |
Other Identifiers: | 1822 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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