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Microstructural evolution of Mg-4%Nd alloy processed by high-pressure torsion

Microstructural evolution of Mg-4%Nd alloy processed by high-pressure torsion
Microstructural evolution of Mg-4%Nd alloy processed by high-pressure torsion
Disks of as-extruded Mg-4Nd alloy were processed by high-pressure torsion (HPT) through ¼ to 5 turns at room temperature. The first 1/4 turn of HPT induces large numbers of twins and some dislocation tangles in the center region of the disk. With increase of torsional straining, the twinning is inhibited gradually and the dislocation density increases relating to the formation of dislocation substructures and ultimately transforming to high fractions of equiaxed gains which have an average grain size of ~200 nm and high-angle boundaries. HPT significantly improves the values of microhardness of this alloy. The hardness values in both the central and edge regions show a sharp rise after HPT for 1/4 turn and exhibit nearly saturation after 1/2 turn although there is a trend of a slight increase with increasing numbers of turns. The experimental results suggest more homogeneous microstructures may be produced by larger numbers of turns in the HPT process.
1662-9752
391-396
Bai, J.
823a05e0-144e-4dad-97f3-f8d942141e6c
Xue, F.
a12e5e56-5f2e-4223-9f79-99ee5958aa68
Alhajeri, Saleh N.
4d3f50b6-87ab-4690-87dd-bea08fb1c77f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bai, J.
823a05e0-144e-4dad-97f3-f8d942141e6c
Xue, F.
a12e5e56-5f2e-4223-9f79-99ee5958aa68
Alhajeri, Saleh N.
4d3f50b6-87ab-4690-87dd-bea08fb1c77f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Bai, J., Xue, F., Alhajeri, Saleh N. and Langdon, Terence G. (2011) Microstructural evolution of Mg-4%Nd alloy processed by high-pressure torsion. Materials Science Forum, 667-669, 391-396. (doi:10.4028/www.scientific.net/MSF).

Record type: Article

Abstract

Disks of as-extruded Mg-4Nd alloy were processed by high-pressure torsion (HPT) through ¼ to 5 turns at room temperature. The first 1/4 turn of HPT induces large numbers of twins and some dislocation tangles in the center region of the disk. With increase of torsional straining, the twinning is inhibited gradually and the dislocation density increases relating to the formation of dislocation substructures and ultimately transforming to high fractions of equiaxed gains which have an average grain size of ~200 nm and high-angle boundaries. HPT significantly improves the values of microhardness of this alloy. The hardness values in both the central and edge regions show a sharp rise after HPT for 1/4 turn and exhibit nearly saturation after 1/2 turn although there is a trend of a slight increase with increasing numbers of turns. The experimental results suggest more homogeneous microstructures may be produced by larger numbers of turns in the HPT process.

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Published date: 2011
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 187543
URI: http://eprints.soton.ac.uk/id/eprint/187543
ISSN: 1662-9752
PURE UUID: 174230c2-7df5-46dc-99a9-7d335857aaec
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 17 May 2011 13:17
Last modified: 15 Mar 2024 03:13

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Contributors

Author: J. Bai
Author: F. Xue
Author: Saleh N. Alhajeri

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