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In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V

G.C Obasi, R.J Moat, D.G. Leo Prakash, W Kockelmann, J. Quinta da Fonseca, M Preuss, Leo Prakash Orcid Logo

Acta Materialia, Volume: 60, Issue: 20, Pages: 7169 - 7182

Swansea University Author: Leo Prakash Orcid Logo

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Abstract

In the present study, in situ phase transformation experiments have been carried out using neutron diffraction to monitor the texture evolution during the α → β → α phase transformation in Ti–6Al–4V with and without 0.4% yttrium additions. The aim of adding yttrium was to control β grain growth abov...

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Published in: Acta Materialia
ISSN: 1359-6454
Published: 2012
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URI: https://cronfa.swan.ac.uk/Record/cronfa15868
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spelling 2015-11-02T14:19:53.4996413 v2 15868 2013-09-10 In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V bd72868c48af6c0b04bf9f6bb48ce324 0000-0002-8812-8927 Leo Prakash Leo Prakash true false 2013-09-10 MTLS In the present study, in situ phase transformation experiments have been carried out using neutron diffraction to monitor the texture evolution during the α → β → α phase transformation in Ti–6Al–4V with and without 0.4% yttrium additions. The aim of adding yttrium was to control β grain growth above the β transus by Zener pinning. First, both alloys were thermomechanically processed to generate a similar starting α texture and grain morphology. Subsequently, both materials were heat treated above the β transus up to 1250 °C followed by furnace cooling to 210 °C to promote diffusional phase transformation starting from β grain boundaries. In situ texture measurements were taken during α → β → α phase transformation starting at room temperature, 800 °C, 950 °C, above β transus (1050 and 1250 °C), and back to near room temperature. The degree of variant selection was determined by comparing the predicted transformation texture during heating and cooling based on the Burgers relationship and the assumption of no variant selection with the measured textures. It was found that during heating β grows from the pre-existing β and that the β texture evolved even before the β transus was exceeded. The β texture strengthened noticeably above the β transus in the case of conventional Ti–6Al–4V but not Ti–6Al–4V–0.4Y, which was related to β grain coarsening. The level of variant selection was clearly affected by grain coarsening and the formation of β texture components that contribute to the 〈1 1 1〉//normal direction (ND) γ fibre texture rotated about 10° away from ND. Journal Article Acta Materialia 60 20 7169 7182 1359-6454 Titanium alloys, Texture evolution, Neutron diffraction, Variant selection 12 12 2012 2012-12-12 10.1016/j.actamat.2012.09.026 http://www.sciencedirect.com/science/article/pii/S1359645412006490 In the view point of academia and industry, this research provides the mechanistic understanding of phase transformation related texture changes in Titanium, which is highly critical for Ti processing. This work has been carried out in association with the Rutherford Appleton Laboratory, UK (GEM diffractometer facilities, winfried.kockelmann@stfc.ac.uk). Furthermore, this is published in, the No.1 ranked journal in Metallurgy , Acta Materialia (5 year Impact factor: 4.395, citations: 2). COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2015-11-02T14:19:53.4996413 2013-09-10T13:31:21.9024731 College of Engineering Engineering G.C Obasi 1 R.J Moat 2 D.G. Leo Prakash 3 W Kockelmann 4 J. Quinta da Fonseca 5 M Preuss 6 Leo Prakash 0000-0002-8812-8927 7
title In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
spellingShingle In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
Leo Prakash
title_short In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
title_full In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
title_fullStr In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
title_full_unstemmed In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
title_sort In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V
author_id_str_mv bd72868c48af6c0b04bf9f6bb48ce324
author_id_fullname_str_mv bd72868c48af6c0b04bf9f6bb48ce324_***_Leo Prakash
author Leo Prakash
author2 G.C Obasi
R.J Moat
D.G. Leo Prakash
W Kockelmann
J. Quinta da Fonseca
M Preuss
Leo Prakash
format Journal article
container_title Acta Materialia
container_volume 60
container_issue 20
container_start_page 7169
publishDate 2012
institution Swansea University
issn 1359-6454
doi_str_mv 10.1016/j.actamat.2012.09.026
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
url http://www.sciencedirect.com/science/article/pii/S1359645412006490
document_store_str 0
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description In the present study, in situ phase transformation experiments have been carried out using neutron diffraction to monitor the texture evolution during the α → β → α phase transformation in Ti–6Al–4V with and without 0.4% yttrium additions. The aim of adding yttrium was to control β grain growth above the β transus by Zener pinning. First, both alloys were thermomechanically processed to generate a similar starting α texture and grain morphology. Subsequently, both materials were heat treated above the β transus up to 1250 °C followed by furnace cooling to 210 °C to promote diffusional phase transformation starting from β grain boundaries. In situ texture measurements were taken during α → β → α phase transformation starting at room temperature, 800 °C, 950 °C, above β transus (1050 and 1250 °C), and back to near room temperature. The degree of variant selection was determined by comparing the predicted transformation texture during heating and cooling based on the Burgers relationship and the assumption of no variant selection with the measured textures. It was found that during heating β grows from the pre-existing β and that the β texture evolved even before the β transus was exceeded. The β texture strengthened noticeably above the β transus in the case of conventional Ti–6Al–4V but not Ti–6Al–4V–0.4Y, which was related to β grain coarsening. The level of variant selection was clearly affected by grain coarsening and the formation of β texture components that contribute to the 〈1 1 1〉//normal direction (ND) γ fibre texture rotated about 10° away from ND.
published_date 2012-12-12T03:25:26Z
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