Influence of strain reversals during high pressure torsion process on strengthening in Al-Cu-Mg (-Li) alloy


Zhang, Jiu When, Starink, Marco J., Gao, Nong and Zhou, Wen Long (2010) Influence of strain reversals during high pressure torsion process on strengthening in Al-Cu-Mg (-Li) alloy. Materials Science Forum , 667-669, 809-814. (doi:10.4028/www.scientific.net/MSF.667-669.809).

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Description/Abstract

The strengthening of AlCuMg(Li) alloys subjected to high pressure torsion (HPT) deformation with strain reversals was studied by microhardness (Hv) tests and differential scanning calorimetry (DSC). It was found that the strengthening is lower for both cyclic HPT (c-HPT) and single reversal HPT (sr-HPT) as compared to monotonic HPT (m-HPT). The DSC results demonstrate that |HPT influences S phase precipitation. With increasing strain, the maximum heat flow (height of the S peak) and the heat content of S formation peaks increases. There is a larger S heat content reaction in the periphery of HPT processed disks compared with those in the centre. Strain reversal also has a significant influence on the S precipitation. The strengthening during HPT deformation is discussed in terms of the density of statistically stored and geometrically necessary dislocations.

Item Type: Article
ISSNs: 0255-5476 (print)
1422-6375 (electronic)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 170221
Date Deposited: 04 Jan 2011 14:31
Last Modified: 28 Mar 2014 15:10
Projects:
MEMS COMPONENTS FORMED FROM NANOSTRUCTURAL METALS
Funded by: EPSRC (EP/D00313X/1)
Led by: Nong Gao
1 August 2006 to 31 October 2009
URI: http://eprints.soton.ac.uk/id/eprint/170221

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