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Effect of high-pressure torsion on microstructures, mechanical properties and corrosion resistance of cast pure Mg

Effect of high-pressure torsion on microstructures, mechanical properties and corrosion resistance of cast pure Mg
Effect of high-pressure torsion on microstructures, mechanical properties and corrosion resistance of cast pure Mg
High-pressure torsion (HPT) processing was applied to cast pure magnesium and the effects of the deformation on the microstructure, hardness, tensile properties and corrosion resistance were evaluated. The microstructures of the processed samples were examined by electron backscatter diffraction and the mechanical properties were determined by Vickers hardness and tensile testing. The corrosion resistance was studied using electrochemical impedance spectroscopy in a 3.5% NaCl solution. The results show that HPT processing effectively refines the grain size of Mg from millimeters in the cast structure to a few micrometers after processing and also creates a basal texture on the surface. It was found that one or five turns of HPT produced no significant difference in the grain size of the processed Mg and the hardness was a maximum after one turn due to recovery in some grains. Measurements showed that the yield strength of the cast Mg increased by about seven times whereas the corrosion resistance was not significantly affected by the HPT processing.
0022-2461
16585-16597
Ahmadkhaniha, Donya
ee4d4038-a32a-4e62-8a79-0b2e04502ef8
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Jaskari, Matias
ce26f721-a37b-4780-a42f-fae7716f0091
Järvenpää, Antti
47acc2bc-33fa-4eb5-905e-09c4740a5e53
Sohi, Mahmoud Heydarzadeh
a54166b9-361f-40fc-b776-f552f1eb3975
Zanella, Caterina
157dceb0-f71c-4529-8a45-ef9e721b73f5
Karjalainen, L. Pentti
816be86e-5b6a-47b4-8e91-8c0e33a1d7cc
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Ahmadkhaniha, Donya
ee4d4038-a32a-4e62-8a79-0b2e04502ef8
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Jaskari, Matias
ce26f721-a37b-4780-a42f-fae7716f0091
Järvenpää, Antti
47acc2bc-33fa-4eb5-905e-09c4740a5e53
Sohi, Mahmoud Heydarzadeh
a54166b9-361f-40fc-b776-f552f1eb3975
Zanella, Caterina
157dceb0-f71c-4529-8a45-ef9e721b73f5
Karjalainen, L. Pentti
816be86e-5b6a-47b4-8e91-8c0e33a1d7cc
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Ahmadkhaniha, Donya, Huang, Yi, Jaskari, Matias, Järvenpää, Antti, Sohi, Mahmoud Heydarzadeh, Zanella, Caterina, Karjalainen, L. Pentti and Langdon, Terence G. (2018) Effect of high-pressure torsion on microstructures, mechanical properties and corrosion resistance of cast pure Mg. Journal of Materials Science, 53 (24), 16585-16597. (doi:10.1007/s10853-018-2779-1).

Record type: Article

Abstract

High-pressure torsion (HPT) processing was applied to cast pure magnesium and the effects of the deformation on the microstructure, hardness, tensile properties and corrosion resistance were evaluated. The microstructures of the processed samples were examined by electron backscatter diffraction and the mechanical properties were determined by Vickers hardness and tensile testing. The corrosion resistance was studied using electrochemical impedance spectroscopy in a 3.5% NaCl solution. The results show that HPT processing effectively refines the grain size of Mg from millimeters in the cast structure to a few micrometers after processing and also creates a basal texture on the surface. It was found that one or five turns of HPT produced no significant difference in the grain size of the processed Mg and the hardness was a maximum after one turn due to recovery in some grains. Measurements showed that the yield strength of the cast Mg increased by about seven times whereas the corrosion resistance was not significantly affected by the HPT processing.

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Accepted/In Press date: 4 August 2018
e-pub ahead of print date: 13 August 2018
Published date: 1 December 2018

Identifiers

Local EPrints ID: 422955
URI: https://eprints.soton.ac.uk/id/eprint/422955
ISSN: 0022-2461
PURE UUID: 5aa4c24c-60ea-40b6-950b-514f5b2966d3
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 08 Aug 2018 16:30
Last modified: 14 Mar 2019 01:45

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Contributors

Author: Donya Ahmadkhaniha
Author: Yi Huang ORCID iD
Author: Matias Jaskari
Author: Antti Järvenpää
Author: Mahmoud Heydarzadeh Sohi
Author: Caterina Zanella
Author: L. Pentti Karjalainen

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