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Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy
Non-isothermal oxidation is one of the important issues related to the safe application of high-temperature titanium alloys, so this study focuses on the non-isothermal oxidation behavior and mechanism of near-α titanium alloys. The thermogravimetry-differential scanning calorimetry (TGA/DSC) method...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6267292/ https://www.ncbi.nlm.nih.gov/pubmed/30380791 http://dx.doi.org/10.3390/ma11112141 |
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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 related to the safe application of high-temperature titanium alloys, so this study focuses on the non-isothermal oxidation behavior and mechanism of near-α titanium alloys. The thermogravimetry-differential scanning calorimetry (TGA/DSC) method was used to study the non-isothermal oxidation behavior of TA29 titanium alloy heated from room temperature to 1450 °C at a heating rate of 40 °C/min under pure oxygen atmosphere. The results show that non-isothermal oxidation behavior can be divided into five stages, including no oxidation, slow oxidation, accelerated oxidation, severe oxidation and deceleration oxidation; for the three-layer TiO(2) scale, Zr, Nb, Ta are enriched in the intermediate layer, while Al is rich in the inner layer and Sn is segregated at the oxide-substrate interface, which is related to their diffusion rates in the subsurface α case. The oxidation mechanism for each stage is: oxygen barrier effect of a thin compact oxide film; oxygen dissolution; lattice transformation accelerating the dissolution and diffusion of oxygen; oxide formation; oxygen barrier effect of recrystallization and sintering microstructure in outer oxide scale. The alloying elements with high valence state and high diffusion rate in α-Ti are favorable to slow down the oxidation rate at the stage governed by oxide formation. |
format | Online Article Text |
id | pubmed-6267292 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-62672922018-12-17 Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy Ouyang, Peixuan Mi, Guangbao Li, Peijie He, Liangju Cao, Jingxia Huang, Xu Materials (Basel) Article Non-isothermal oxidation is one of the important issues related to the safe application of high-temperature titanium alloys, so this study focuses on the non-isothermal oxidation behavior and mechanism of near-α titanium alloys. The thermogravimetry-differential scanning calorimetry (TGA/DSC) method was used to study the non-isothermal oxidation behavior of TA29 titanium alloy heated from room temperature to 1450 °C at a heating rate of 40 °C/min under pure oxygen atmosphere. The results show that non-isothermal oxidation behavior can be divided into five stages, including no oxidation, slow oxidation, accelerated oxidation, severe oxidation and deceleration oxidation; for the three-layer TiO(2) scale, Zr, Nb, Ta are enriched in the intermediate layer, while Al is rich in the inner layer and Sn is segregated at the oxide-substrate interface, which is related to their diffusion rates in the subsurface α case. The oxidation mechanism for each stage is: oxygen barrier effect of a thin compact oxide film; oxygen dissolution; lattice transformation accelerating the dissolution and diffusion of oxygen; oxide formation; oxygen barrier effect of recrystallization and sintering microstructure in outer oxide scale. The alloying elements with high valence state and high diffusion rate in α-Ti are favorable to slow down the oxidation rate at the stage governed by oxide formation. MDPI 2018-10-30 /pmc/articles/PMC6267292/ /pubmed/30380791 http://dx.doi.org/10.3390/ma11112141 Text en © 2018 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 Behavior and Mechanism of a High Temperature Near-α Titanium Alloy |
title | Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy |
title_full | Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy |
title_fullStr | Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy |
title_full_unstemmed | Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy |
title_short | Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy |
title_sort | non-isothermal oxidation behavior and mechanism of a high temperature near-α titanium alloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6267292/ https://www.ncbi.nlm.nih.gov/pubmed/30380791 http://dx.doi.org/10.3390/ma11112141 |
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