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Microstructural stability and grain growth kinetics in an extruded fine-grained Mg–Gd–Y–Zr alloy

Microstructural stability and grain growth kinetics in an extruded fine-grained Mg–Gd–Y–Zr alloy
Microstructural stability and grain growth kinetics in an extruded fine-grained Mg–Gd–Y–Zr alloy
The grain growth kinetics of an extruded fine-grained Mg–9Gd–4Y–0.4Zr (wt%) alloy was investigated by static annealing in the temperature range of 673–773 K. In addition to the microstructural evolution, textural evolution of the material was also studied during high temperature exposure. The material revealed an unusual basal texture in the extruded condition which was weakened after annealing. The material behavior can be divided into two temperature regimes, namely from 673 to 723 K and from 723 to 773 K. According to the obtained data, although the material shows superior thermal stability in comparison with the conventional Mg alloys, it loses most of its resistance to grain growth at temperatures higher than 673 K. It was observed that although the Mg3(Gd,Y) precipitates have sufficient thermal stability to restrict grain growth, significant grain growth occurs at the highest temperatures where increased mobility of the grain boundaries seems to be dominant. However, there is restricted growth at lower temperatures, where the grain growth is controlled by lattice self-diffusion.
0022-2461
4940-4951
Alizadeh, R.
8452d2d2-68c1-4a95-840f-8e19855799af
Mahmudi, R.
1e661235-7596-4004-9ace-4c81e6fe9b21
Ngan, A. H. W.
44dfeaba-996b-4379-b2d0-fae94af5bd8f
Langdon, T. G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Alizadeh, R.
8452d2d2-68c1-4a95-840f-8e19855799af
Mahmudi, R.
1e661235-7596-4004-9ace-4c81e6fe9b21
Ngan, A. H. W.
44dfeaba-996b-4379-b2d0-fae94af5bd8f
Langdon, T. G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Alizadeh, R., Mahmudi, R., Ngan, A. H. W. and Langdon, T. G. (2015) Microstructural stability and grain growth kinetics in an extruded fine-grained Mg–Gd–Y–Zr alloy. Journal of Materials Science, 50 (14), 4940-4951. (doi:10.1007/s10853-015-9041-x).

Record type: Article

Abstract

The grain growth kinetics of an extruded fine-grained Mg–9Gd–4Y–0.4Zr (wt%) alloy was investigated by static annealing in the temperature range of 673–773 K. In addition to the microstructural evolution, textural evolution of the material was also studied during high temperature exposure. The material revealed an unusual basal texture in the extruded condition which was weakened after annealing. The material behavior can be divided into two temperature regimes, namely from 673 to 723 K and from 723 to 773 K. According to the obtained data, although the material shows superior thermal stability in comparison with the conventional Mg alloys, it loses most of its resistance to grain growth at temperatures higher than 673 K. It was observed that although the Mg3(Gd,Y) precipitates have sufficient thermal stability to restrict grain growth, significant grain growth occurs at the highest temperatures where increased mobility of the grain boundaries seems to be dominant. However, there is restricted growth at lower temperatures, where the grain growth is controlled by lattice self-diffusion.

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More information

e-pub ahead of print date: 5 May 2015
Published date: July 2015
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 382383
URI: http://eprints.soton.ac.uk/id/eprint/382383
ISSN: 0022-2461
PURE UUID: 7634bc5a-ef0a-41e3-9bcb-79da0d443dc6
ORCID for T. G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 27 Oct 2015 10:22
Last modified: 19 Nov 2019 01:49

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