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Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys
The metallurgical preparation and microstructure of as-cast Ti-45Al-2W-xC (in at.%) alloys were investigated. Five alloys with carbon content ranging from 0.38 to 1.96 at.% were prepared by vacuum induction melting (VIM) in graphite crucibles, followed by centrifugal casting into graphite moulds. A...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9320707/ https://www.ncbi.nlm.nih.gov/pubmed/35888514 http://dx.doi.org/10.3390/ma15145049 |
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author | Cegan, Tomas Kamyshnykova, Kateryna Lapin, Juraj Szurman, Ivo Jurica, Jan Klimantova, Vendula |
author_facet | Cegan, Tomas Kamyshnykova, Kateryna Lapin, Juraj Szurman, Ivo Jurica, Jan Klimantova, Vendula |
author_sort | Cegan, Tomas |
collection | PubMed |
description | The metallurgical preparation and microstructure of as-cast Ti-45Al-2W-xC (in at.%) alloys were investigated. Five alloys with carbon content ranging from 0.38 to 1.96 at.% were prepared by vacuum induction melting (VIM) in graphite crucibles, followed by centrifugal casting into graphite moulds. A master 15W-85Al (at.%) alloy with a relatively low melting point and TiC powder were used to facilitate fast dissolution of W during VIM and to achieve the designed content of C in the as-cast alloys, respectively. The increase in the content of C affects the solidification path of the studied alloys. Differential thermal analysis (DTA) and microstructural observations show that the alloys with carbon content up to 0.75 at.% solidify with β primary phase and their dendritic as-cast microstructure consists of the α(2)(Ti(3)Al) + γ(TiAl) lamellar regions, retained B2 phase enriched by W and single γ phase formed in the interdendritic region. The increase in the content of C above 0.75 at.% leads to the formation of primary lathe-shaped Ti(2)AlC carbides, which act as effective heterogeneous nucleation sites of β dendrites during the solidification and grain refinement of the alloys with 1.15 and 1.96 at.% C. The increase in the content of C leads to an increase in Vickers hardness and elastic modulus in the alloys containing 1.96 at.% C. |
format | Online Article Text |
id | pubmed-9320707 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-93207072022-07-27 Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys Cegan, Tomas Kamyshnykova, Kateryna Lapin, Juraj Szurman, Ivo Jurica, Jan Klimantova, Vendula Materials (Basel) Article The metallurgical preparation and microstructure of as-cast Ti-45Al-2W-xC (in at.%) alloys were investigated. Five alloys with carbon content ranging from 0.38 to 1.96 at.% were prepared by vacuum induction melting (VIM) in graphite crucibles, followed by centrifugal casting into graphite moulds. A master 15W-85Al (at.%) alloy with a relatively low melting point and TiC powder were used to facilitate fast dissolution of W during VIM and to achieve the designed content of C in the as-cast alloys, respectively. The increase in the content of C affects the solidification path of the studied alloys. Differential thermal analysis (DTA) and microstructural observations show that the alloys with carbon content up to 0.75 at.% solidify with β primary phase and their dendritic as-cast microstructure consists of the α(2)(Ti(3)Al) + γ(TiAl) lamellar regions, retained B2 phase enriched by W and single γ phase formed in the interdendritic region. The increase in the content of C above 0.75 at.% leads to the formation of primary lathe-shaped Ti(2)AlC carbides, which act as effective heterogeneous nucleation sites of β dendrites during the solidification and grain refinement of the alloys with 1.15 and 1.96 at.% C. The increase in the content of C leads to an increase in Vickers hardness and elastic modulus in the alloys containing 1.96 at.% C. MDPI 2022-07-20 /pmc/articles/PMC9320707/ /pubmed/35888514 http://dx.doi.org/10.3390/ma15145049 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Cegan, Tomas Kamyshnykova, Kateryna Lapin, Juraj Szurman, Ivo Jurica, Jan Klimantova, Vendula Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys |
title | Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys |
title_full | Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys |
title_fullStr | Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys |
title_full_unstemmed | Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys |
title_short | Processing and Microstructure of As-Cast Ti-45Al-2W-xC Alloys |
title_sort | processing and microstructure of as-cast ti-45al-2w-xc alloys |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9320707/ https://www.ncbi.nlm.nih.gov/pubmed/35888514 http://dx.doi.org/10.3390/ma15145049 |
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