Simultaneous enhancement of oxidation resistance in Nb-Si based alloys at 1250 °C by GdNbTiO6 formation and microstructural refinement

Dezhi Chen; Wotai Gong; Xiaofu Zhang; Chao Xu; Dongxin Wang; Shuo Yin; Ruirun Chen

doi:10.1016/j.apsadv.2026.100983

Simultaneous enhancement of oxidation resistance in Nb-Si based alloys at 1250 °C by GdNbTiO₆ formation and microstructural refinement

Dezhi Chen
, Wotai Gong
, Xiaofu Zhang
, Chao Xu
, Dongxin Wang
, Shuo Yin
, Ruirun Chen^*

^*Corresponding author for this work

School of Materials Science and Engineering

Trinity College Dublin
Harbin Institute of Technology
Northwest Rare Metal Materials Research Institute Ningxia Co., Ltd.

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

6 Scopus citations

Abstract

The oxidation resistance and behavior of Nb-16Si-20Ti-1.5Zr-1B-1C- x Gd ( x = 0.05, 0.1, 0.2, 0.4 at.%) alloys at 1250 °C were investigated. A suitable Gd addition (0.2 at.%) effectively refines the microstructure. Oxidation tests reveal that the alloy with 0.2 at.% Gd exhibits the best oxidation resistance, with a weight gain of 166.7 mg/cm² after 50 h at 1250 °C, which is 39.2% lower than that of the 0.05 at.% Gd alloy (274.4 mg/cm²). During oxidation, Gd₂O₃ reacts with Nb₂O₅ and TiO₂ to form GdNbTiO₆, which exists at phase boundaries and impedes the inward diffusion of oxygen. Moreover, a refined microstructure reduces the oxidation rate and enhances the oxide-scale density. Therefore, appropriate Gd addition (0.2 at.%) enhances oxidation resistance by promoting GdNbTiO₆ formation and microstructure refinement.

Original language	English
Article number	100983
Journal	Applied Surface Science Advances
Volume	34
DOIs	https://doi.org/10.1016/j.apsadv.2026.100983
State	Published - Sep 2026

Keywords

GdNbTiO
Microstructure refinement
Nb-Si based alloy
Oxidation behavior
Oxidation resistance

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10.1016/j.apsadv.2026.100983

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@article{c7d994ed5deb4f9996501241c7288398,

title = "Simultaneous enhancement of oxidation resistance in Nb-Si based alloys at 1250 °C by GdNbTiO6 formation and microstructural refinement",

abstract = "The oxidation resistance and behavior of Nb-16Si-20Ti-1.5Zr-1B-1C- x Gd ( x = 0.05, 0.1, 0.2, 0.4 at.\%) alloys at 1250 °C were investigated. A suitable Gd addition (0.2 at.\%) effectively refines the microstructure. Oxidation tests reveal that the alloy with 0.2 at.\% Gd exhibits the best oxidation resistance, with a weight gain of 166.7 mg/cm² after 50 h at 1250 °C, which is 39.2\% lower than that of the 0.05 at.\% Gd alloy (274.4 mg/cm²). During oxidation, Gd2O3 reacts with Nb2O5 and TiO2 to form GdNbTiO6, which exists at phase boundaries and impedes the inward diffusion of oxygen. Moreover, a refined microstructure reduces the oxidation rate and enhances the oxide-scale density. Therefore, appropriate Gd addition (0.2 at.\%) enhances oxidation resistance by promoting GdNbTiO6 formation and microstructure refinement.",

keywords = "GdNbTiO, Microstructure refinement, Nb-Si based alloy, Oxidation behavior, Oxidation resistance",

author = "Dezhi Chen and Wotai Gong and Xiaofu Zhang and Chao Xu and Dongxin Wang and Shuo Yin and Ruirun Chen",

note = "Publisher Copyright: {\textcopyright} 2026 The Author(s).",

year = "2026",

month = sep,

doi = "10.1016/j.apsadv.2026.100983",

language = "英语",

volume = "34",

journal = "Applied Surface Science Advances",

issn = "2666-5239",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Simultaneous enhancement of oxidation resistance in Nb-Si based alloys at 1250 °C by GdNbTiO6 formation and microstructural refinement

AU - Chen, Dezhi

AU - Gong, Wotai

AU - Zhang, Xiaofu

AU - Xu, Chao

AU - Wang, Dongxin

AU - Yin, Shuo

AU - Chen, Ruirun

PY - 2026/9

Y1 - 2026/9

N2 - The oxidation resistance and behavior of Nb-16Si-20Ti-1.5Zr-1B-1C- x Gd ( x = 0.05, 0.1, 0.2, 0.4 at.%) alloys at 1250 °C were investigated. A suitable Gd addition (0.2 at.%) effectively refines the microstructure. Oxidation tests reveal that the alloy with 0.2 at.% Gd exhibits the best oxidation resistance, with a weight gain of 166.7 mg/cm² after 50 h at 1250 °C, which is 39.2% lower than that of the 0.05 at.% Gd alloy (274.4 mg/cm²). During oxidation, Gd2O3 reacts with Nb2O5 and TiO2 to form GdNbTiO6, which exists at phase boundaries and impedes the inward diffusion of oxygen. Moreover, a refined microstructure reduces the oxidation rate and enhances the oxide-scale density. Therefore, appropriate Gd addition (0.2 at.%) enhances oxidation resistance by promoting GdNbTiO6 formation and microstructure refinement.

AB - The oxidation resistance and behavior of Nb-16Si-20Ti-1.5Zr-1B-1C- x Gd ( x = 0.05, 0.1, 0.2, 0.4 at.%) alloys at 1250 °C were investigated. A suitable Gd addition (0.2 at.%) effectively refines the microstructure. Oxidation tests reveal that the alloy with 0.2 at.% Gd exhibits the best oxidation resistance, with a weight gain of 166.7 mg/cm² after 50 h at 1250 °C, which is 39.2% lower than that of the 0.05 at.% Gd alloy (274.4 mg/cm²). During oxidation, Gd2O3 reacts with Nb2O5 and TiO2 to form GdNbTiO6, which exists at phase boundaries and impedes the inward diffusion of oxygen. Moreover, a refined microstructure reduces the oxidation rate and enhances the oxide-scale density. Therefore, appropriate Gd addition (0.2 at.%) enhances oxidation resistance by promoting GdNbTiO6 formation and microstructure refinement.

KW - GdNbTiO

KW - Microstructure refinement

KW - Nb-Si based alloy

KW - Oxidation behavior

KW - Oxidation resistance

UR - https://www.scopus.com/pages/publications/105035111589

U2 - 10.1016/j.apsadv.2026.100983

DO - 10.1016/j.apsadv.2026.100983

M3 - 文章

AN - SCOPUS:105035111589

SN - 2666-5239

VL - 34

JO - Applied Surface Science Advances

JF - Applied Surface Science Advances

M1 - 100983

ER -

Simultaneous enhancement of oxidation resistance in Nb-Si based alloys at 1250 °C by GdNbTiO₆ formation and microstructural refinement

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Keywords

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