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Solute segregation on structural defects in an ultrafine-grained Al-Cu-Mg alloy

Solute segregation on structural defects in an ultrafine-grained Al-Cu-Mg alloy
Solute segregation on structural defects in an ultrafine-grained Al-Cu-Mg alloy
Microstructure evolution of an ultrafine-grained Al-Cu-Mg alloy has been studied during and after high-pressure torsion (HPT) at ambient temperature. Hardness distribution in aluminum disks is characterized by micro-Vickers hardness. The ultrafine-grained microstructures after HPT are examined by transmission electron microscopy (TEM), X-ray diffraction and differential scanning calorimetry (DSC). The location, structure and composition of clusters and nanoscale precipitates along lattice defects (dislocations, cell walls or grain boundaries) are clarified by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The microstructure observation reveals grain refinement and dislocations contribute to a significant increase in hardness. Differential scanning calorimetry (DSC) is used to analyze the energy absorption during this stage of hardening. It is found that, during during the DSC after HPT work hardening, a substantial exothermic heat evolution occurs. The source of reaction enthalpy involves dislocation annihilation, the growth of ultrafine grains and grain boundary segregation.
Chen, Ying
338aa31f-c129-49c9-b5b7-b583836a8cc1
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Sha, Gang
b4bad9fa-ae61-42b0-97de-b21c8c444519
Ringer, Simon P.
e183738b-964a-4891-a1fa-6d86451bf0a5
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Chen, Ying
338aa31f-c129-49c9-b5b7-b583836a8cc1
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Sha, Gang
b4bad9fa-ae61-42b0-97de-b21c8c444519
Ringer, Simon P.
e183738b-964a-4891-a1fa-6d86451bf0a5
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51

Chen, Ying, Gao, Nong, Sha, Gang, Ringer, Simon P. and Starink, Marco J. (2014) Solute segregation on structural defects in an ultrafine-grained Al-Cu-Mg alloy. NanoSPD6: 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France. 29 Jun - 03 Jul 2014.

Record type: Conference or Workshop Item (Other)

Abstract

Microstructure evolution of an ultrafine-grained Al-Cu-Mg alloy has been studied during and after high-pressure torsion (HPT) at ambient temperature. Hardness distribution in aluminum disks is characterized by micro-Vickers hardness. The ultrafine-grained microstructures after HPT are examined by transmission electron microscopy (TEM), X-ray diffraction and differential scanning calorimetry (DSC). The location, structure and composition of clusters and nanoscale precipitates along lattice defects (dislocations, cell walls or grain boundaries) are clarified by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The microstructure observation reveals grain refinement and dislocations contribute to a significant increase in hardness. Differential scanning calorimetry (DSC) is used to analyze the energy absorption during this stage of hardening. It is found that, during during the DSC after HPT work hardening, a substantial exothermic heat evolution occurs. The source of reaction enthalpy involves dislocation annihilation, the growth of ultrafine grains and grain boundary segregation.

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More information

e-pub ahead of print date: 2014
Venue - Dates: NanoSPD6: 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France, 2014-06-29 - 2014-07-03
Related URLs:
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 372071
URI: http://eprints.soton.ac.uk/id/eprint/372071
PURE UUID: 3e10cf53-5e3e-4e8e-8fc8-d1f57a8a9874
ORCID for Nong Gao: ORCID iD orcid.org/0000-0002-7430-0319

Catalogue record

Date deposited: 26 Nov 2014 15:36
Last modified: 11 May 2022 01:37

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Contributors

Author: Ying Chen
Author: Nong Gao ORCID iD
Author: Gang Sha
Author: Simon P. Ringer

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