Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition

Yueling Guo; Lina Jia; Huarui Zhang; Fengxiang Zhang; Hu Zhang

doi:10.1016/j.intermet.2018.08.004

Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition

Yueling Guo, Lina Jia^*, Huarui Zhang, Fengxiang Zhang, Hu Zhang

^*Corresponding author for this work

Beihang University

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

42 Citations (Scopus)

Abstract

The effect of yttrium on the microstructure and high-temperature oxidation performance of Nb-15Si-24Ti-4Cr-2Al-2Hf (at.%) alloys was investigated. Alloys containing different yttrium contents were designed, aiming at maximizing the beneficial effect of yttrium addition and avoiding the possible adverse effect of over-doped yttrium. Results showed that Y was primarily partitioned in γ-Nb₅Si₃, relative to Nb solid solution (Nbss), Nb₃Si and α-Nb₅Si₃. Microstructural refinement and oxidation resistance enhancement were achieved by yttrium addition up to 0.3 at.%, accompanied by the transition towards parabolic oxidation kinetics. An adverse effect of over-doped yttrium (0.5 at.% addition) by coarsening the microstructure and deteriorating the oxidation resistance was confirmed. A relatively continuous glassy SiO₂ layer was generated in the oxide scale formed on the Y-containing alloys with enhanced oxidation resistance.

Original language	English
Pages (from-to)	165-172
Number of pages	8
Journal	Intermetallics
Volume	101
DOIs	https://doi.org/10.1016/j.intermet.2018.08.004
Publication status	Published - Oct 2018
Externally published	Yes

Keywords

Aero-engine components
Casting
Intermetallics
Microstructure
Oxidation

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10.1016/j.intermet.2018.08.004

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@article{e4ae0b720fcf4233bb1eaee4f21f34f7,

title = "Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition",

abstract = "The effect of yttrium on the microstructure and high-temperature oxidation performance of Nb-15Si-24Ti-4Cr-2Al-2Hf (at.%) alloys was investigated. Alloys containing different yttrium contents were designed, aiming at maximizing the beneficial effect of yttrium addition and avoiding the possible adverse effect of over-doped yttrium. Results showed that Y was primarily partitioned in γ-Nb5Si3, relative to Nb solid solution (Nbss), Nb3Si and α-Nb5Si3. Microstructural refinement and oxidation resistance enhancement were achieved by yttrium addition up to 0.3 at.%, accompanied by the transition towards parabolic oxidation kinetics. An adverse effect of over-doped yttrium (0.5 at.% addition) by coarsening the microstructure and deteriorating the oxidation resistance was confirmed. A relatively continuous glassy SiO2 layer was generated in the oxide scale formed on the Y-containing alloys with enhanced oxidation resistance.",

keywords = "Aero-engine components, Casting, Intermetallics, Microstructure, Oxidation",

author = "Yueling Guo and Lina Jia and Huarui Zhang and Fengxiang Zhang and Hu Zhang",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = oct,

doi = "10.1016/j.intermet.2018.08.004",

language = "English",

volume = "101",

pages = "165--172",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition

AU - Guo, Yueling

AU - Jia, Lina

AU - Zhang, Huarui

AU - Zhang, Fengxiang

AU - Zhang, Hu

PY - 2018/10

Y1 - 2018/10

N2 - The effect of yttrium on the microstructure and high-temperature oxidation performance of Nb-15Si-24Ti-4Cr-2Al-2Hf (at.%) alloys was investigated. Alloys containing different yttrium contents were designed, aiming at maximizing the beneficial effect of yttrium addition and avoiding the possible adverse effect of over-doped yttrium. Results showed that Y was primarily partitioned in γ-Nb5Si3, relative to Nb solid solution (Nbss), Nb3Si and α-Nb5Si3. Microstructural refinement and oxidation resistance enhancement were achieved by yttrium addition up to 0.3 at.%, accompanied by the transition towards parabolic oxidation kinetics. An adverse effect of over-doped yttrium (0.5 at.% addition) by coarsening the microstructure and deteriorating the oxidation resistance was confirmed. A relatively continuous glassy SiO2 layer was generated in the oxide scale formed on the Y-containing alloys with enhanced oxidation resistance.

AB - The effect of yttrium on the microstructure and high-temperature oxidation performance of Nb-15Si-24Ti-4Cr-2Al-2Hf (at.%) alloys was investigated. Alloys containing different yttrium contents were designed, aiming at maximizing the beneficial effect of yttrium addition and avoiding the possible adverse effect of over-doped yttrium. Results showed that Y was primarily partitioned in γ-Nb5Si3, relative to Nb solid solution (Nbss), Nb3Si and α-Nb5Si3. Microstructural refinement and oxidation resistance enhancement were achieved by yttrium addition up to 0.3 at.%, accompanied by the transition towards parabolic oxidation kinetics. An adverse effect of over-doped yttrium (0.5 at.% addition) by coarsening the microstructure and deteriorating the oxidation resistance was confirmed. A relatively continuous glassy SiO2 layer was generated in the oxide scale formed on the Y-containing alloys with enhanced oxidation resistance.

KW - Aero-engine components

KW - Casting

KW - Intermetallics

KW - Microstructure

KW - Oxidation

UR - http://www.scopus.com/inward/record.url?scp=85051276611&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2018.08.004

DO - 10.1016/j.intermet.2018.08.004

M3 - Article

AN - SCOPUS:85051276611

SN - 0966-9795

VL - 101

SP - 165

EP - 172

JO - Intermetallics

JF - Intermetallics

ER -

Enhancing the oxidation resistance of Nb-Si based alloys by yttrium addition

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Keywords

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