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
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
October 2017
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), .
(doi:10.1007/s10853-017-1331-z).
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
Text
Aindow-Figures
- Accepted Manuscript
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
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Date deposited: 04 Aug 2017 16:30
Last modified: 16 Mar 2024 05:36
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Contributors
Author:
Y. Sun
Author:
M. Aindow
Author:
R.J.H. Herbert
Author:
E.J. Lavernia,
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