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Structural modifications during linear heating of a bulk ultrafine-grained Al-Cu-Mg alloy produced by high-pressure torsion

Structural modifications during linear heating of a bulk ultrafine-grained Al-Cu-Mg alloy produced by high-pressure torsion
Structural modifications during linear heating of a bulk ultrafine-grained Al-Cu-Mg alloy produced by high-pressure torsion
High pressure torsion (HPT) is an effective method to enhance mechanical properties of metallic materials by refining the grain structure and strain-hardening. The main aim of this work is to investigate the structural modifications in a HPT processed commercial Al-Cu-Mg alloy during linear heating after HPT. The structural changes were analyzed using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). After HPT, peak temperature for formation of S phase decreases from 260°C to 240°C. It indicates that dislocations introduced by severe plastic deformation provide more nucleation sites for precipitates. The crystallite size of the sample after HPT at room temperature is 66nm and the dislocation density is 3.3×10^14 m^-2. On heating from 210 to 240°C the dislocation density decreases dramatically from 2×10^14 m^-2 to 6.8×10^14 m^-2 and crystallite size increases from 54 to 142 nm. The evolution of strength measured by microhardness is discussed within the context of grain-size hardening and dislocation hardening.
Chen, Ying
338aa31f-c129-49c9-b5b7-b583836a8cc1
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Chen, Ying
338aa31f-c129-49c9-b5b7-b583836a8cc1
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51

Chen, Ying, Gao, Nong and Starink, M.J. (2013) Structural modifications during linear heating of a bulk ultrafine-grained Al-Cu-Mg alloy produced by high-pressure torsion. 2013 TMS Annual Meeting & Exhibition, United States. 03 - 07 Mar 2013.

Record type: Conference or Workshop Item (Other)

Abstract

High pressure torsion (HPT) is an effective method to enhance mechanical properties of metallic materials by refining the grain structure and strain-hardening. The main aim of this work is to investigate the structural modifications in a HPT processed commercial Al-Cu-Mg alloy during linear heating after HPT. The structural changes were analyzed using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). After HPT, peak temperature for formation of S phase decreases from 260°C to 240°C. It indicates that dislocations introduced by severe plastic deformation provide more nucleation sites for precipitates. The crystallite size of the sample after HPT at room temperature is 66nm and the dislocation density is 3.3×10^14 m^-2. On heating from 210 to 240°C the dislocation density decreases dramatically from 2×10^14 m^-2 to 6.8×10^14 m^-2 and crystallite size increases from 54 to 142 nm. The evolution of strength measured by microhardness is discussed within the context of grain-size hardening and dislocation hardening.

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More information

e-pub ahead of print date: March 2013
Venue - Dates: 2013 TMS Annual Meeting & Exhibition, United States, 2013-03-03 - 2013-03-07
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 372235
URI: https://eprints.soton.ac.uk/id/eprint/372235
PURE UUID: 0614c616-4ba2-4259-ae54-945e041e50fb

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Date deposited: 04 Dec 2014 14:56
Last modified: 17 Jul 2017 21:43

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