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The influence of grain size and strain rate on the mechanical behavior of pure magnesium

The influence of grain size and strain rate on the mechanical behavior of pure magnesium
The influence of grain size and strain rate on the mechanical behavior of pure magnesium
Commercially pure magnesium was processed by severe plastic deformation techniques and thermo-mechanical routes to produce samples with grain sizes in the range from 1.0 to 300 µm. Tensile testing of a fine-grained material revealed a decrease in hardening and an increase in strain rate sensitivity with decreasing testing strain rate from 10?2 to 10?7 s?1. Compression testing of fine-grained samples not only revealed similar trend, but also there was a transition from twinning to slip-dominated flow. Dynamic ultra-microhardness testing showed an increase in strain rate sensitivity with decreasing grain size. The trend of decreasing hardening rate and increasing strain rate sensitivity with decreasing strain rate was not observed in samples with a coarser grain size. Compression testing at different temperatures suggests that a creep mechanism with stress exponent of ~7 and activation energy close to grain boundary diffusion operates at low strain rates and moderate temperatures. A model for a new deformation mechanism is proposed based on the present experimental results and published data.
fast strain rate, slow strain rate, hpt processing, slip trace analysis, basal slip, true strain, crss ratio, pure magnesium, magnesium alloy, plane strain compression, true stress, jump test, stress exponent
0022-2461
3013-3024
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Poggiali, Flávia S.J.
012aab4f-1577-4db0-90b4-c4ee9aad2dc6
Silva, Cláudio L.P.
10754b74-b2d1-4276-b476-9fc4cd5e1a4f
Cetlin, Paulo R.
6fe5efb8-7976-4d56-8aae-08cbf76b9628
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Poggiali, Flávia S.J.
012aab4f-1577-4db0-90b4-c4ee9aad2dc6
Silva, Cláudio L.P.
10754b74-b2d1-4276-b476-9fc4cd5e1a4f
Cetlin, Paulo R.
6fe5efb8-7976-4d56-8aae-08cbf76b9628
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B., Poggiali, Flávia S.J., Silva, Cláudio L.P., Cetlin, Paulo R. and Langdon, Terence G. (2016) The influence of grain size and strain rate on the mechanical behavior of pure magnesium. Journal of Materials Science, 51 (6), 3013-3024. (doi:10.1007/s10853-015-9612-x).

Record type: Article

Abstract

Commercially pure magnesium was processed by severe plastic deformation techniques and thermo-mechanical routes to produce samples with grain sizes in the range from 1.0 to 300 µm. Tensile testing of a fine-grained material revealed a decrease in hardening and an increase in strain rate sensitivity with decreasing testing strain rate from 10?2 to 10?7 s?1. Compression testing of fine-grained samples not only revealed similar trend, but also there was a transition from twinning to slip-dominated flow. Dynamic ultra-microhardness testing showed an increase in strain rate sensitivity with decreasing grain size. The trend of decreasing hardening rate and increasing strain rate sensitivity with decreasing strain rate was not observed in samples with a coarser grain size. Compression testing at different temperatures suggests that a creep mechanism with stress exponent of ~7 and activation energy close to grain boundary diffusion operates at low strain rates and moderate temperatures. A model for a new deformation mechanism is proposed based on the present experimental results and published data.

Full text not available from this repository.

More information

Accepted/In Press date: 15 November 2015
e-pub ahead of print date: 30 November 2015
Published date: March 2016
Keywords: fast strain rate, slow strain rate, hpt processing, slip trace analysis, basal slip, true strain, crss ratio, pure magnesium, magnesium alloy, plane strain compression, true stress, jump test, stress exponent
Organisations: Engineering Mats & Surface Engineerg Gp, Engineering Science Unit, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 386934
URI: http://eprints.soton.ac.uk/id/eprint/386934
ISSN: 0022-2461
PURE UUID: 9fd602d1-fcb6-468d-abcb-3bb547b28307
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 05 Feb 2016 14:36
Last modified: 17 Dec 2019 01:50

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