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The effect of high-pressure torsion on microstructure, hardness and corrosion behavior for pure magnesium and different magnesium alloys

The effect of high-pressure torsion on microstructure, hardness and corrosion behavior for pure magnesium and different magnesium alloys
The effect of high-pressure torsion on microstructure, hardness and corrosion behavior for pure magnesium and different magnesium alloys

Severe plastic deformation by high pressure torsion (HPT) is used to process and refine the grain structure of commercial purity magnesium and AZ31, AZ91, and ZK60 magnesium alloys. Transmission electron microscopy shows that the microstructure of pure magnesium is characterized by a bi-modal grain size distribution with grains in the range of a few microns and ultrafine grains after HPT, whereas the magnesium alloys display a homogeneous ultrafine grain structure after processing. X ray diffraction analysis reveals that the AZ91 alloy displays the largest lattice microstrain and this alloy also exhibits the highest hardness after processing. The processed AZ31 and the ZK60 alloys show similar microstructures and maximum values of hardness. Contrary to earlier reports of significant improvements in the corrosion resistance of magnesium alloys in biological environments, the present results show that processing by HPT has no significant effect on the corrosion behavior of magnesium alloys in a 3.5% NaCl solution. By contrast, pure magnesium exhibits an increased corrosion resistance after HPT.

corrosion, hardness, high pressure torsion, magnesium, microstructure
1438-1656
1-9
Silva, Claudio L.P.
83391ea7-c3ae-4729-af7f-62fa94541934
Soares, Renata B.
deabafe8-36af-47ce-8b8f-14e4555f20df
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Lins, Vanessa F.C.
6cc9cd28-501a-495d-a452-5ed5366b0601
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Silva, Claudio L.P.
83391ea7-c3ae-4729-af7f-62fa94541934
Soares, Renata B.
deabafe8-36af-47ce-8b8f-14e4555f20df
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Lins, Vanessa F.C.
6cc9cd28-501a-495d-a452-5ed5366b0601
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Silva, Claudio L.P., Soares, Renata B., Pereira, Pedro Henrique R., Figueiredo, Roberto B., Lins, Vanessa F.C. and Langdon, Terence G. (2019) The effect of high-pressure torsion on microstructure, hardness and corrosion behavior for pure magnesium and different magnesium alloys. Advanced Engineering Materials, 21 (3), 1-9, [1801081]. (doi:10.1002/adem.201801081).

Record type: Article

Abstract

Severe plastic deformation by high pressure torsion (HPT) is used to process and refine the grain structure of commercial purity magnesium and AZ31, AZ91, and ZK60 magnesium alloys. Transmission electron microscopy shows that the microstructure of pure magnesium is characterized by a bi-modal grain size distribution with grains in the range of a few microns and ultrafine grains after HPT, whereas the magnesium alloys display a homogeneous ultrafine grain structure after processing. X ray diffraction analysis reveals that the AZ91 alloy displays the largest lattice microstrain and this alloy also exhibits the highest hardness after processing. The processed AZ31 and the ZK60 alloys show similar microstructures and maximum values of hardness. Contrary to earlier reports of significant improvements in the corrosion resistance of magnesium alloys in biological environments, the present results show that processing by HPT has no significant effect on the corrosion behavior of magnesium alloys in a 3.5% NaCl solution. By contrast, pure magnesium exhibits an increased corrosion resistance after HPT.

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More information

Accepted/In Press date: 3 December 2018
e-pub ahead of print date: 2 January 2019
Published date: March 2019
Keywords: corrosion, hardness, high pressure torsion, magnesium, microstructure

Identifiers

Local EPrints ID: 429829
URI: http://eprints.soton.ac.uk/id/eprint/429829
ISSN: 1438-1656
PURE UUID: 3c823416-b20e-4157-a11d-93cb60718bf0
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 05 Apr 2019 16:30
Last modified: 07 Oct 2020 01:47

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