Sub-stoichiometry-facilitated oxidation kinetics in a δ-TixC-doped Ti-based alloy

Shaolou Wei; Lujun Huang; Yuntong Zhu; Zhe Shi; Xinting Li; Lin Geng

doi:10.1038/s41529-018-0067-9

Sub-stoichiometry-facilitated oxidation kinetics in a δ-Ti_xC-doped Ti-based alloy

Shaolou Wei
, Lujun Huang^*
, Yuntong Zhu
, Zhe Shi
, Xinting Li
, Lin Geng^*

^*Corresponding author for this work

Harbin Institute of Technology
Massachusetts Institute of Technology

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Titanium carbide has been widely considered as a stabilizer to alleviate the serious chemical activity of Ti-based alloys at elevated temperatures. However, a reverse effect may also take place: we show the sub-stoichiometry characteristic of δ-Ti_xC can facilitate the oxidation kinetics of a Ti-6Al-4V alloy to a significant extent. In particular, oxygen atoms tend to preferentially occupy the vacant carbon sites within the Ti₂C phase, giving rise to a higher oxidation rate. The intrinsic mechanisms were understood with a combination of ab initio simulation and experimental validation.

Original language	English
Article number	3
Journal	npj Materials Degradation
Volume	3
Issue number	1
DOIs	https://doi.org/10.1038/s41529-018-0067-9
State	Published - Dec 2019
Externally published	Yes

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title = "Sub-stoichiometry-facilitated oxidation kinetics in a δ-TixC-doped Ti-based alloy",

abstract = "Titanium carbide has been widely considered as a stabilizer to alleviate the serious chemical activity of Ti-based alloys at elevated temperatures. However, a reverse effect may also take place: we show the sub-stoichiometry characteristic of δ-TixC can facilitate the oxidation kinetics of a Ti-6Al-4V alloy to a significant extent. In particular, oxygen atoms tend to preferentially occupy the vacant carbon sites within the Ti2C phase, giving rise to a higher oxidation rate. The intrinsic mechanisms were understood with a combination of ab initio simulation and experimental validation.",

author = "Shaolou Wei and Lujun Huang and Yuntong Zhu and Zhe Shi and Xinting Li and Lin Geng",

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T1 - Sub-stoichiometry-facilitated oxidation kinetics in a δ-TixC-doped Ti-based alloy

AU - Wei, Shaolou

AU - Huang, Lujun

AU - Zhu, Yuntong

AU - Shi, Zhe

AU - Li, Xinting

AU - Geng, Lin

PY - 2019/12

Y1 - 2019/12

N2 - Titanium carbide has been widely considered as a stabilizer to alleviate the serious chemical activity of Ti-based alloys at elevated temperatures. However, a reverse effect may also take place: we show the sub-stoichiometry characteristic of δ-TixC can facilitate the oxidation kinetics of a Ti-6Al-4V alloy to a significant extent. In particular, oxygen atoms tend to preferentially occupy the vacant carbon sites within the Ti2C phase, giving rise to a higher oxidation rate. The intrinsic mechanisms were understood with a combination of ab initio simulation and experimental validation.

AB - Titanium carbide has been widely considered as a stabilizer to alleviate the serious chemical activity of Ti-based alloys at elevated temperatures. However, a reverse effect may also take place: we show the sub-stoichiometry characteristic of δ-TixC can facilitate the oxidation kinetics of a Ti-6Al-4V alloy to a significant extent. In particular, oxygen atoms tend to preferentially occupy the vacant carbon sites within the Ti2C phase, giving rise to a higher oxidation rate. The intrinsic mechanisms were understood with a combination of ab initio simulation and experimental validation.

UR - https://www.scopus.com/pages/publications/85070066377

U2 - 10.1038/s41529-018-0067-9

DO - 10.1038/s41529-018-0067-9

M3 - 文章

AN - SCOPUS:85070066377

SN - 2397-2106

VL - 3

JO - npj Materials Degradation

JF - npj Materials Degradation

IS - 1

M1 - 3

ER -

Sub-stoichiometry-facilitated oxidation kinetics in a δ-Ti_xC-doped Ti-based alloy

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