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Development of a magnesium-alumina composite through cold consolidation of machining chips by high-pressure torsion

Development of a magnesium-alumina composite through cold consolidation of machining chips by high-pressure torsion
Development of a magnesium-alumina composite through cold consolidation of machining chips by high-pressure torsion
High pressure torsion offers unique conditions for the consolidation of metallic particles at room temperature owing to the high hydrostatic compressive stresses combined with the high shear strain. A Mg-Al2O3 composite was produced by consolidation of machining chips of pure magnesium with 10% in volume of alumina particles. The consolidation process was investigated by optical and scanning electron microscopy and X-ray microtomography. It is shown that shear deformation concentrates along thick alumina particle layers in the initial stage of deformation. A significant fraction of the hard phase particles are pushed into the outflow in quasi-constrained HPT and a homogeneous composite is achieved after significant straining. The composite exhibits a refined microstructure, a higher hardness and improved resistance against room temperature creep compared to pure magnesium.
alumina, consolidation, metal matrix composite, magnesium, High-pressure Torsion
0925-8388
422-427
de Castro, Moara M.
cb6729d8-fd38-46a4-91e3-a87da53d0e99
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Isaac Neta, Augusta C.
8bbd9d2d-a43b-442f-8d29-ae1a319ca616
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
de Castro, Moara M.
cb6729d8-fd38-46a4-91e3-a87da53d0e99
Pereira, Pedro Henrique R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Isaac Neta, Augusta C.
8bbd9d2d-a43b-442f-8d29-ae1a319ca616
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

de Castro, Moara M., Pereira, Pedro Henrique R., Isaac Neta, Augusta C., Figueiredo, Roberto B. and Langdon, Terence G. (2019) Development of a magnesium-alumina composite through cold consolidation of machining chips by high-pressure torsion. Journal of Alloys and Compounds, 780, 422-427. (doi:10.1016/j.jallcom.2018.11.357).

Record type: Article

Abstract

High pressure torsion offers unique conditions for the consolidation of metallic particles at room temperature owing to the high hydrostatic compressive stresses combined with the high shear strain. A Mg-Al2O3 composite was produced by consolidation of machining chips of pure magnesium with 10% in volume of alumina particles. The consolidation process was investigated by optical and scanning electron microscopy and X-ray microtomography. It is shown that shear deformation concentrates along thick alumina particle layers in the initial stage of deformation. A significant fraction of the hard phase particles are pushed into the outflow in quasi-constrained HPT and a homogeneous composite is achieved after significant straining. The composite exhibits a refined microstructure, a higher hardness and improved resistance against room temperature creep compared to pure magnesium.

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Castro-AEM-November2018 - Accepted Manuscript
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More information

Accepted/In Press date: 27 November 2018
e-pub ahead of print date: 28 November 2018
Published date: 5 April 2019
Keywords: alumina, consolidation, metal matrix composite, magnesium, High-pressure Torsion

Identifiers

Local EPrints ID: 426792
URI: http://eprints.soton.ac.uk/id/eprint/426792
ISSN: 0925-8388
PURE UUID: 5d99d2c3-21f9-490e-b7cb-a3aead030366
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 12 Dec 2018 17:30
Last modified: 22 Nov 2021 07:01

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Contributors

Author: Moara M. de Castro
Author: Pedro Henrique R. Pereira
Author: Augusta C. Isaac Neta
Author: Roberto B. Figueiredo

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