The University of Southampton
University of Southampton Institutional Repository

Evolution of microstructure in AZ91 alloy processed by high-pressure torsion

Evolution of microstructure in AZ91 alloy processed by high-pressure torsion
Evolution of microstructure in AZ91 alloy processed by high-pressure torsion
An investigation has been conducted on AZ91 magnesium alloy processed in high-pressure torsion (HPT) at 296, 423 and 473 K for different numbers of turns. The microstructure has altered significantly after processing at all processing temperatures. Extensive grain refinement has been observed in the alloy processed at 296 K with apparent grain sizes reduced down to 35 nm. Segmentation of coarse grains by twinning has been observed in the alloy processed at 423 K and 473 K with average apparent grain sizes of 180 nm and 250 nm. Substantial homogeneity in microhardness has been observed in the alloy processed at 296 K compared to that found at 423 K and 473 K. The ultrafine-grained AZ91 alloy exhibited a significant dependence of the yield strength on grain size as shown by the microhardness measurements, and it obeys the expected Hall–Petch relationship. The alloying elements, fraction of nano-sized particles of β-phase, and the dominance of basal slip and pyramidal modes have additional effects on the strengthening of the alloy processed at 296 K.
0022-2461
3380-3389
Al-Zubaydi, Ahmed
ab0946e5-c193-4f29-82b7-a06423f496f5
Zhilyaev, Alexander
c34e095d-1136-46ab-8f27-4d1cf516257f
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Kucita, Pawee
addac9be-f92d-4f53-be8f-4aa974e5d154
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Al-Zubaydi, Ahmed
ab0946e5-c193-4f29-82b7-a06423f496f5
Zhilyaev, Alexander
c34e095d-1136-46ab-8f27-4d1cf516257f
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Kucita, Pawee
addac9be-f92d-4f53-be8f-4aa974e5d154
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17

Al-Zubaydi, Ahmed, Zhilyaev, Alexander, Wang, Shuncai, Kucita, Pawee and Reed, Philippa (2016) Evolution of microstructure in AZ91 alloy processed by high-pressure torsion. Journal of Materials Science, 51 (7), 3380-3389.

Record type: Article

Abstract

An investigation has been conducted on AZ91 magnesium alloy processed in high-pressure torsion (HPT) at 296, 423 and 473 K for different numbers of turns. The microstructure has altered significantly after processing at all processing temperatures. Extensive grain refinement has been observed in the alloy processed at 296 K with apparent grain sizes reduced down to 35 nm. Segmentation of coarse grains by twinning has been observed in the alloy processed at 423 K and 473 K with average apparent grain sizes of 180 nm and 250 nm. Substantial homogeneity in microhardness has been observed in the alloy processed at 296 K compared to that found at 423 K and 473 K. The ultrafine-grained AZ91 alloy exhibited a significant dependence of the yield strength on grain size as shown by the microhardness measurements, and it obeys the expected Hall–Petch relationship. The alloying elements, fraction of nano-sized particles of β-phase, and the dominance of basal slip and pyramidal modes have additional effects on the strengthening of the alloy processed at 296 K.

This record has no associated files available for download.

More information

Published date: 21 December 2016

Identifiers

Local EPrints ID: 457448
URI: http://eprints.soton.ac.uk/id/eprint/457448
ISSN: 0022-2461
PURE UUID: 0117fccf-023c-4412-a79e-a1ec32f61043
ORCID for Philippa Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 08 Jun 2022 16:40
Last modified: 09 Jun 2022 01:33

Export record

Contributors

Author: Ahmed Al-Zubaydi
Author: Alexander Zhilyaev
Author: Shuncai Wang
Author: Pawee Kucita
Author: Philippa Reed ORCID iD

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×