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Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds
Non-isothermal oxidation is one of the important issues for the safe application of Ti-Al alloys, so this study aimed to illustrate the non-isothermal oxidation behaviors and the corresponding mechanisms of a TiAl-based alloy in comparison with a Ti(3)Al-based alloy. The non-isothermal oxidation beh...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651085/ https://www.ncbi.nlm.nih.gov/pubmed/31262063 http://dx.doi.org/10.3390/ma12132114 |
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author | Ouyang, Peixuan Mi, Guangbao Li, Peijie He, Liangju Cao, Jingxia Huang, Xu |
author_facet | Ouyang, Peixuan Mi, Guangbao Li, Peijie He, Liangju Cao, Jingxia Huang, Xu |
author_sort | Ouyang, Peixuan |
collection | PubMed |
description | Non-isothermal oxidation is one of the important issues for the safe application of Ti-Al alloys, so this study aimed to illustrate the non-isothermal oxidation behaviors and the corresponding mechanisms of a TiAl-based alloy in comparison with a Ti(3)Al-based alloy. The non-isothermal oxidation behaviors of Ti-46Al-2Cr-5Nb and Ti-24Al-15Nb-1.5Mo alloys in pure oxygen were comparatively investigated with a thermogravimetry-differential scanning calorimetry (TGA/DSC) simultaneous thermal analyzer heating from room temperature to 1450 °C with a heating rate of 40 °C/min. When the temperature rose above 1280 °C, the oxidation rate of the Ti-46Al-2Cr-5Nb alloy sharply increased and exceeded that of the Ti-24Al-15Nb-1.5Mo alloy owing to the occurrence of internal oxidation. When the temperature was higher than 1350 °C, the oxidation rate of the Ti-46Al-2Cr-5Nb alloy decreased obviously due to the generation of an oxygen-barrier β-Al(2)TiO(5)-rich layer by a chemical reaction between Al(2)O(3) and TiO(2) in the oxide scale. Based on Wagner’s theory of internal oxidation, the reason for the occurrence of internal oxidation in the Ti-46Al-2Cr-5Nb alloy is the formation of the α phase in the subsurface, while no internal oxidation occurred in the Ti-24Al-15Nb-1.5Mo alloy due to the existence of the β phase in the subsurface with the enrichment of Nb and Mo. |
format | Online Article Text |
id | pubmed-6651085 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-66510852019-08-07 Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds Ouyang, Peixuan Mi, Guangbao Li, Peijie He, Liangju Cao, Jingxia Huang, Xu Materials (Basel) Article Non-isothermal oxidation is one of the important issues for the safe application of Ti-Al alloys, so this study aimed to illustrate the non-isothermal oxidation behaviors and the corresponding mechanisms of a TiAl-based alloy in comparison with a Ti(3)Al-based alloy. The non-isothermal oxidation behaviors of Ti-46Al-2Cr-5Nb and Ti-24Al-15Nb-1.5Mo alloys in pure oxygen were comparatively investigated with a thermogravimetry-differential scanning calorimetry (TGA/DSC) simultaneous thermal analyzer heating from room temperature to 1450 °C with a heating rate of 40 °C/min. When the temperature rose above 1280 °C, the oxidation rate of the Ti-46Al-2Cr-5Nb alloy sharply increased and exceeded that of the Ti-24Al-15Nb-1.5Mo alloy owing to the occurrence of internal oxidation. When the temperature was higher than 1350 °C, the oxidation rate of the Ti-46Al-2Cr-5Nb alloy decreased obviously due to the generation of an oxygen-barrier β-Al(2)TiO(5)-rich layer by a chemical reaction between Al(2)O(3) and TiO(2) in the oxide scale. Based on Wagner’s theory of internal oxidation, the reason for the occurrence of internal oxidation in the Ti-46Al-2Cr-5Nb alloy is the formation of the α phase in the subsurface, while no internal oxidation occurred in the Ti-24Al-15Nb-1.5Mo alloy due to the existence of the β phase in the subsurface with the enrichment of Nb and Mo. MDPI 2019-06-30 /pmc/articles/PMC6651085/ /pubmed/31262063 http://dx.doi.org/10.3390/ma12132114 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Ouyang, Peixuan Mi, Guangbao Li, Peijie He, Liangju Cao, Jingxia Huang, Xu Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds |
title | Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds |
title_full | Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds |
title_fullStr | Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds |
title_full_unstemmed | Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds |
title_short | Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds |
title_sort | non-isothermal oxidation behaviors and mechanisms of ti-al intermetallic compounds |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651085/ https://www.ncbi.nlm.nih.gov/pubmed/31262063 http://dx.doi.org/10.3390/ma12132114 |
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