The effect of aluminium on twinning in binary alpha-titanium

Fitzner, Arnas; Prakash, Leo; da, Joao Quinta; Thomas, Matthew; Zhang, Shu-Yan; Kelleher, Joe; Manuel, Pascal; Preuss, Michael

doi:10.1016/j.actamat.2015.09.048

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The effect of aluminium on twinning in binary alpha-titanium

Arnas Fitzner, Leo Prakash

, Joao Quinta da Fonseca, Matthew Thomas, Shu-Yan Zhang, Joe Kelleher, Pascal Manuel, Michael Preuss

Acta Materialia, Volume: 103, Pages: 341 - 351

Swansea University Author: Leo Prakash

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DOI (Published version): 10.1016/j.actamat.2015.09.048

Abstract

The deformation mechanisms of binary Ti–Al model alloys (0–13.1 at.% Aluminium) have been investigated with respect to the twinning activity using in-situ loading in combination with neutron diffraction as well as detailed post mortem electron backscatter diffraction analysis. A consistent starting...

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Published in:	Acta Materialia
ISSN:	1359-6454
Published:	2016
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URI:	https://cronfa.swan.ac.uk/Record/cronfa24179
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spelling	2020-12-18T15:32:10.1097766 v2 24179 2015-11-06 The effect of aluminium on twinning in binary alpha-titanium bd72868c48af6c0b04bf9f6bb48ce324 0000-0002-8812-8927 Leo Prakash Leo Prakash true false 2015-11-06 MTLS The deformation mechanisms of binary Ti–Al model alloys (0–13.1 at.% Aluminium) have been investigated with respect to the twinning activity using in-situ loading in combination with neutron diffraction as well as detailed post mortem electron backscatter diffraction analysis. A consistent starting grain size and texture was generated for all alloys promoting tensile twinning during compression testing. Long-wavelength neutron diffraction and selected area diffraction transmission electron microscopy analysis were carried out to detect evidence of Aluminium ordering and Ti3Al formation.It was found that raising the Aluminium content in Titanium does first slightly enhance twinning, with {10View the MathML source2}<10View the MathML source1> tensile twinning being by far the dominant type, while the critical residual intergranular strains for twin initiation decreases. This suggests that either the lowering of stacking fault energy by Aluminium or its solute solution strengthening effect are important factors. At around 7 at.% Aluminium a turning point in twinning activity was noticed and a further increase in Aluminium did result in a dramatic loss of twinning activity particularly when the material had been exposed to an additional low temperature age. The dramatic decrease of twinning activity is strongly correlated with increasing evidence of short range ordering and also early signs of Ti3Al-formation in case of the highest Aluminium content. In addition, electron backscatter diffraction analysis revealed that the formation of Aluminium ordered zones do severely hinder growth of twin boundaries. Journal Article Acta Materialia 103 341 351 1359-6454 Deformation twinning; Ti–Al binary alloys; Neutron diffraction; EBSD; Short range ordering 15 1 2016 2016-01-15 10.1016/j.actamat.2015.09.048 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-12-18T15:32:10.1097766 2015-11-06T12:53:39.0834589 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Arnas Fitzner 1 Leo Prakash 0000-0002-8812-8927 2 Joao Quinta da Fonseca 3 Matthew Thomas 4 Shu-Yan Zhang 5 Joe Kelleher 6 Pascal Manuel 7 Michael Preuss 8 0024179-21072016111313.pdf Fitzner2015.pdf 2016-07-21T11:13:13.3270000 Output 3936555 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true English http://creativecommons.org/licenses/by/4.0/
title	The effect of aluminium on twinning in binary alpha-titanium
spellingShingle	The effect of aluminium on twinning in binary alpha-titanium Leo Prakash
title_short	The effect of aluminium on twinning in binary alpha-titanium
title_full	The effect of aluminium on twinning in binary alpha-titanium
title_fullStr	The effect of aluminium on twinning in binary alpha-titanium
title_full_unstemmed	The effect of aluminium on twinning in binary alpha-titanium
title_sort	The effect of aluminium on twinning in binary alpha-titanium
author_id_str_mv	bd72868c48af6c0b04bf9f6bb48ce324
author_id_fullname_str_mv	bd72868c48af6c0b04bf9f6bb48ce324_***_Leo Prakash
author	Leo Prakash
author2	Arnas Fitzner Leo Prakash Joao Quinta da Fonseca Matthew Thomas Shu-Yan Zhang Joe Kelleher Pascal Manuel Michael Preuss
format	Journal article
container_title	Acta Materialia
container_volume	103
container_start_page	341
publishDate	2016
institution	Swansea University
issn	1359-6454
doi_str_mv	10.1016/j.actamat.2015.09.048
college_str	Faculty of Science and Engineering
hierarchytype
hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str	1
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description	The deformation mechanisms of binary Ti–Al model alloys (0–13.1 at.% Aluminium) have been investigated with respect to the twinning activity using in-situ loading in combination with neutron diffraction as well as detailed post mortem electron backscatter diffraction analysis. A consistent starting grain size and texture was generated for all alloys promoting tensile twinning during compression testing. Long-wavelength neutron diffraction and selected area diffraction transmission electron microscopy analysis were carried out to detect evidence of Aluminium ordering and Ti3Al formation.It was found that raising the Aluminium content in Titanium does first slightly enhance twinning, with {10View the MathML source2}<10View the MathML source1> tensile twinning being by far the dominant type, while the critical residual intergranular strains for twin initiation decreases. This suggests that either the lowering of stacking fault energy by Aluminium or its solute solution strengthening effect are important factors. At around 7 at.% Aluminium a turning point in twinning activity was noticed and a further increase in Aluminium did result in a dramatic loss of twinning activity particularly when the material had been exposed to an additional low temperature age. The dramatic decrease of twinning activity is strongly correlated with increasing evidence of short range ordering and also early signs of Ti3Al-formation in case of the highest Aluminium content. In addition, electron backscatter diffraction analysis revealed that the formation of Aluminium ordered zones do severely hinder growth of twin boundaries.
published_date	2016-01-15T03:28:38Z
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score	11.035655

The effect of aluminium on twinning in binary alpha-titanium

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