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Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys

Jing Li, Spencer Jeffs Orcid Logo, Mark Whittaker Orcid Logo, Nigel Martin

Materials & Design, Volume: 195, Start page: 109064

Swansea University Authors: Jing Li, Spencer Jeffs Orcid Logo, Mark Whittaker Orcid Logo

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DOI (Published version): 10.1016/j.matdes.2020.109064

Abstract

Boron has been used to refine the microstructures in TiAl castings, such as low-pressure turbine (LPT) blades, to improve mechanical properties. However, boride precipitates with undesirable morphologies could reduce ductility and even entirely remove the benefits of grain refinement. Boride size an...

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Published in: Materials & Design
ISSN: 0264-1275
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55034
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first_indexed 2020-08-20T08:44:56Z
last_indexed 2021-12-02T04:10:56Z
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spelling 2021-12-01T13:58:53.1897806 v2 55034 2020-08-20 Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys 63decc944dd44c096082eea7cd16d3f3 Jing Li Jing Li true false 6ff76d567df079d8bf299990849c3d8f 0000-0002-2819-9651 Spencer Jeffs Spencer Jeffs true false a146c6d442cb2c466d096179f9ac97ca 0000-0002-5854-0726 Mark Whittaker Mark Whittaker true false 2020-08-20 MTLS Boron has been used to refine the microstructures in TiAl castings, such as low-pressure turbine (LPT) blades, to improve mechanical properties. However, boride precipitates with undesirable morphologies could reduce ductility and even entirely remove the benefits of grain refinement. Boride size and morphology in variant alloys based on Ti45Al2Mn2Nb1B has found to be closely related to alloying element species and solidification conditions, leading to distinctly different boride formation behaviour. It has been shown that Hf promotes the formation of thin curvy boride flakes whilst Ta promotes the formation of thick straight boride ribbons in the studied cooling rate range. The boride crystal structure changes from TiB with the B27 structure for coarse straight boride to TiB with Bf structure for the curvy boride. Curvy borides have the strongest effect in reducing ductility, regardless of alloy composition. Journal Article Materials & Design 195 109064 Elsevier BV 0264-1275 Titanium aluminides, Borides, Microstructure, Mechanical properties 1 10 2020 2020-10-01 10.1016/j.matdes.2020.109064 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University UKRI; EP/H022309/1; EP/H500383/1 2021-12-01T13:58:53.1897806 2020-08-20T09:41:59.5867247 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Jing Li 1 Spencer Jeffs 0000-0002-2819-9651 2 Mark Whittaker 0000-0002-5854-0726 3 Nigel Martin 4 55034__18105__3f2c37b461dd4fdd82415de01929a31c.pdf 55034 (2).pdf 2020-09-03T11:00:54.7380132 Output 6447357 application/pdf Version of Record true © 2020 The Authors. This is an open access article distributed under the terms of a Creative Commons Attribution 4.0 (CC BY) license . true eng (http://creativecommons.org/licenses/by/4.0/
title Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
spellingShingle Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
Jing Li
Spencer Jeffs
Mark Whittaker
title_short Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
title_full Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
title_fullStr Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
title_full_unstemmed Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
title_sort Boride formation behaviour and their effect on tensile ductility in cast TiAl-based alloys
author_id_str_mv 63decc944dd44c096082eea7cd16d3f3
6ff76d567df079d8bf299990849c3d8f
a146c6d442cb2c466d096179f9ac97ca
author_id_fullname_str_mv 63decc944dd44c096082eea7cd16d3f3_***_Jing Li
6ff76d567df079d8bf299990849c3d8f_***_Spencer Jeffs
a146c6d442cb2c466d096179f9ac97ca_***_Mark Whittaker
author Jing Li
Spencer Jeffs
Mark Whittaker
author2 Jing Li
Spencer Jeffs
Mark Whittaker
Nigel Martin
format Journal article
container_title Materials & Design
container_volume 195
container_start_page 109064
publishDate 2020
institution Swansea University
issn 0264-1275
doi_str_mv 10.1016/j.matdes.2020.109064
publisher Elsevier BV
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
active_str 0
description Boron has been used to refine the microstructures in TiAl castings, such as low-pressure turbine (LPT) blades, to improve mechanical properties. However, boride precipitates with undesirable morphologies could reduce ductility and even entirely remove the benefits of grain refinement. Boride size and morphology in variant alloys based on Ti45Al2Mn2Nb1B has found to be closely related to alloying element species and solidification conditions, leading to distinctly different boride formation behaviour. It has been shown that Hf promotes the formation of thin curvy boride flakes whilst Ta promotes the formation of thick straight boride ribbons in the studied cooling rate range. The boride crystal structure changes from TiB with the B27 structure for coarse straight boride to TiB with Bf structure for the curvy boride. Curvy borides have the strongest effect in reducing ductility, regardless of alloy composition.
published_date 2020-10-01T04:08:58Z
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score 11.012678

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