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Effect of cold rolling on the structure and hydrogen properties of AZ91 and AM60D magnesium alloys subjected to ECAP

Effect of cold rolling on the structure and hydrogen properties of AZ91 and AM60D magnesium alloys subjected to ECAP
Effect of cold rolling on the structure and hydrogen properties of AZ91 and AM60D magnesium alloys subjected to ECAP
It is attainable obtaining an appreciable amelioration of the hydrogen storage ability in magnesium by settling on a suitable sequence of mechanical processing. It is plausible to predict that a reduction in grain size into nanocrystalline dimensions may predispose to a substantial improvement in the diffusion and thermo-dynamical properties in magnesium hydride. This may be realized by Severe Plastic Deformation (SPD). The use of cold rolling after ECAP, a kind of SPD, considerably increases the preferential texture for hydrogenation. In this research, the association of ECAP and cold rolling was used to process commercial AM60D and AZ91 extruded alloys in order to evaluate their use as hydrogen storage materials. The ECAP was conducted under distinct conditions of numbers of passes in order to attain different grain sizes. After ECAP, both materials were cold rolled with the same number of passes for comparison of hydrogenation absorption. Hydriding properties are enhanced by (0001) texture, which improved kinetics mainly in the initial stages of hydrogenation and was effective even with unfavorable grain size. However, the presence of precipitates limits the storing capacity. Finally, it was demonstrated that optimum sorption properties may be acquired with the synergy between fine grains and the best texture.
0360-3199
21822-21831
Jorge Jr., Alberto Moreira
b372b9ad-b397-4142-8f76-09a4be8f41b4
Prokofiev, Egor
52f7a922-4830-47f1-a6e0-9d5e54d39dcd
Triques, Maria Regina Martins
c9ccfb48-f8f8-4a1d-83cc-cdcbe3478cee
Roche, Virginie
065b159a-73ac-4e57-bf38-1f680924f09f
Botta, Walter José
10b09a38-6197-4181-932f-9919626f01af
Kiminami, Claudio Shyinti
a66660bc-b325-4ca1-956b-36996e2b9385
Raab, George I.
f26b6d63-cd5d-4ef0-8523-dca0d7b22f16
Valiev, Ruslan Z.
b617dec0-3860-4d3e-b9b7-6a51f33ee614
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Jorge Jr., Alberto Moreira
b372b9ad-b397-4142-8f76-09a4be8f41b4
Prokofiev, Egor
52f7a922-4830-47f1-a6e0-9d5e54d39dcd
Triques, Maria Regina Martins
c9ccfb48-f8f8-4a1d-83cc-cdcbe3478cee
Roche, Virginie
065b159a-73ac-4e57-bf38-1f680924f09f
Botta, Walter José
10b09a38-6197-4181-932f-9919626f01af
Kiminami, Claudio Shyinti
a66660bc-b325-4ca1-956b-36996e2b9385
Raab, George I.
f26b6d63-cd5d-4ef0-8523-dca0d7b22f16
Valiev, Ruslan Z.
b617dec0-3860-4d3e-b9b7-6a51f33ee614
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Jorge Jr., Alberto Moreira, Prokofiev, Egor, Triques, Maria Regina Martins, Roche, Virginie, Botta, Walter José, Kiminami, Claudio Shyinti, Raab, George I., Valiev, Ruslan Z. and Langdon, Terence G. (2017) Effect of cold rolling on the structure and hydrogen properties of AZ91 and AM60D magnesium alloys subjected to ECAP. International Journal of Hydrogen Energy, 42, 21822-21831. (doi:10.1016/j.ijhydene.2017.07.118).

Record type: Article

Abstract

It is attainable obtaining an appreciable amelioration of the hydrogen storage ability in magnesium by settling on a suitable sequence of mechanical processing. It is plausible to predict that a reduction in grain size into nanocrystalline dimensions may predispose to a substantial improvement in the diffusion and thermo-dynamical properties in magnesium hydride. This may be realized by Severe Plastic Deformation (SPD). The use of cold rolling after ECAP, a kind of SPD, considerably increases the preferential texture for hydrogenation. In this research, the association of ECAP and cold rolling was used to process commercial AM60D and AZ91 extruded alloys in order to evaluate their use as hydrogen storage materials. The ECAP was conducted under distinct conditions of numbers of passes in order to attain different grain sizes. After ECAP, both materials were cold rolled with the same number of passes for comparison of hydrogenation absorption. Hydriding properties are enhanced by (0001) texture, which improved kinetics mainly in the initial stages of hydrogenation and was effective even with unfavorable grain size. However, the presence of precipitates limits the storing capacity. Finally, it was demonstrated that optimum sorption properties may be acquired with the synergy between fine grains and the best texture.

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Alberto-magnesium-accepted - Accepted Manuscript
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Accepted/In Press date: 14 July 2017
e-pub ahead of print date: 2 August 2017
Published date: 24 August 2017

Identifiers

Local EPrints ID: 412882
URI: http://eprints.soton.ac.uk/id/eprint/412882
ISSN: 0360-3199
PURE UUID: 9e250ced-f06e-4814-9bbf-599d11e8f3f9
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 07 Aug 2017 13:42
Last modified: 16 Mar 2024 05:36

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Contributors

Author: Alberto Moreira Jorge Jr.
Author: Egor Prokofiev
Author: Maria Regina Martins Triques
Author: Virginie Roche
Author: Walter José Botta
Author: Claudio Shyinti Kiminami
Author: George I. Raab
Author: Ruslan Z. Valiev

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