Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy

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 w...

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Autores principales:	Yan Huang, Jun Jiang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	severe plastic deformation (SPD) ultrafine grain structure cryogenic temperature dynamic restoration grain boundary dislocation Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/f63ef4a1b5ae4cdfb126b556e23feab9
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spelling	oai:doaj.org-article:f63ef4a1b5ae4cdfb126b556e23feab92021-11-25T18:22:12ZMicrostructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy10.3390/met111118222075-4701https://doaj.org/article/f63ef4a1b5ae4cdfb126b556e23feab92021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1822https://doaj.org/toc/2075-4701The 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 77 K (−196 °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.Yan HuangJun JiangMDPI AGarticlesevere plastic deformation (SPD)ultrafine grain structurecryogenic temperaturedynamic restorationgrain boundary dislocationMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1822, p 1822 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	severe plastic deformation (SPD) ultrafine grain structure cryogenic temperature dynamic restoration grain boundary dislocation Mining engineering. Metallurgy TN1-997
spellingShingle	severe plastic deformation (SPD) ultrafine grain structure cryogenic temperature dynamic restoration grain boundary dislocation Mining engineering. Metallurgy TN1-997 Yan Huang Jun Jiang Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy
description	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 77 K (−196 °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.
format	article
author	Yan Huang Jun Jiang
author_facet	Yan Huang Jun Jiang
author_sort	Yan Huang
title	Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy
title_short	Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy
title_full	Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy
title_fullStr	Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy
title_full_unstemmed	Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy
title_sort	microstructure and texture evolution during severe plastic deformation at cryogenic temperatures in an al-0.1mg alloy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f63ef4a1b5ae4cdfb126b556e23feab9
work_keys_str_mv	AT yanhuang microstructureandtextureevolutionduringsevereplasticdeformationatcryogenictemperaturesinanal01mgalloy AT junjiang microstructureandtextureevolutionduringsevereplasticdeformationatcryogenictemperaturesinanal01mgalloy
_version_	1718411296149340160

Microstructure and Texture Evolution during Severe Plastic Deformation at Cryogenic Temperatures in an Al-0.1Mg Alloy

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