The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

High-pressure torsion-induced phase transformations and grain refinement in Al/Ti composites

High-pressure torsion-induced phase transformations and grain refinement in Al/Ti composites
High-pressure torsion-induced phase transformations and grain refinement in Al/Ti composites
High-pressure torsion (HPT) deformation of multiphase metallic systems produces a high density of interfaces and leads to atomic mixing between the constituent phases. Here we present a study of the interphase boundary structure, grain size evolution and intermetallic phase formation during HPT deformation of a nano-crystalline Al/Ti composite. High-resolution transmission electron microscopy was used to study the structural features of the interphase boundaries. The Al/Ti interphase boundaries were found to significantly promote the generation of dislocations during deformation. After HPT deformation to a shear strain of 87, the average grain sizes of Al and Ti are 22 and 31 nm, respectively. The chemical mixing between the Al and Ti phases was enhanced by defect-mediated short circuit diffusion and dislocation shuffle-controlled plastic deformation at the interphase boundaries. The intermetallic phases formed during HPT deformation are associated with the strain energy stored by the high density of dislocations at the interphase boundaries.
high pressure torsion, phase transformations, titanium aluminides, transmission electron microscopy, TEM
0022-2461
12170–12184
Sun, Y.
f9a339ca-9e03-4220-8df6-0c7ecf47c06c
Aindow, M.
f3ee7b81-f291-43e9-b77a-88d3398ac32e
Herbert, R.J.H.
ddb27a2d-51df-4701-805f-cea24f4aa965
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lavernia,, E.J.
e463b7cd-ed56-434d-bd40-dac618bf8cc8
Sun, Y.
f9a339ca-9e03-4220-8df6-0c7ecf47c06c
Aindow, M.
f3ee7b81-f291-43e9-b77a-88d3398ac32e
Herbert, R.J.H.
ddb27a2d-51df-4701-805f-cea24f4aa965
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lavernia,, E.J.
e463b7cd-ed56-434d-bd40-dac618bf8cc8

Sun, Y., Aindow, M., Herbert, R.J.H., Langdon, Terence G. and Lavernia,, E.J. (2017) High-pressure torsion-induced phase transformations and grain refinement in Al/Ti composites. Journal of Materials Science, 52 (20), 12170–12184. (doi:10.1007/s10853-017-1331-z).

Record type: Article

Abstract

High-pressure torsion (HPT) deformation of multiphase metallic systems produces a high density of interfaces and leads to atomic mixing between the constituent phases. Here we present a study of the interphase boundary structure, grain size evolution and intermetallic phase formation during HPT deformation of a nano-crystalline Al/Ti composite. High-resolution transmission electron microscopy was used to study the structural features of the interphase boundaries. The Al/Ti interphase boundaries were found to significantly promote the generation of dislocations during deformation. After HPT deformation to a shear strain of 87, the average grain sizes of Al and Ti are 22 and 31 nm, respectively. The chemical mixing between the Al and Ti phases was enhanced by defect-mediated short circuit diffusion and dislocation shuffle-controlled plastic deformation at the interphase boundaries. The intermetallic phases formed during HPT deformation are associated with the strain energy stored by the high density of dislocations at the interphase boundaries.

Text
Aindow-ALTI HPT paper text - 03142017 (text) - Accepted Manuscript
Download (49kB)
Text
Aindow-Figures - Accepted Manuscript
Download (4MB)

More information

Accepted/In Press date: 28 June 2017
e-pub ahead of print date: 7 July 2017
Published date: October 2017
Keywords: high pressure torsion, phase transformations, titanium aluminides, transmission electron microscopy, TEM

Identifiers

Local EPrints ID: 412869
URI: http://eprints.soton.ac.uk/id/eprint/412869
ISSN: 0022-2461
PURE UUID: 5b578b62-3a47-4773-adc8-4f0adcb2fb71
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 04 Aug 2017 16:30
Last modified: 22 Nov 2021 05:37

Export record

Altmetrics

Contributors

Author: Y. Sun
Author: M. Aindow
Author: R.J.H. Herbert
Author: E.J. Lavernia,

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.

×