The oxidation-resistance mechanism of WTaNbTiAl refractory high entropy alloy

Yonggang Yan; Kade A. McGarrity; Daniel J. Delia; Curtis Fekety; Kun Wang

doi:10.1016/j.corsci.2022.110377

The oxidation-resistance mechanism of WTaNbTiAl refractory high entropy alloy

Yonggang Yan, Kade A. McGarrity, Daniel J. Delia, Curtis Fekety, Kun Wang

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

39 Scopus citations

Abstract

The WTaNbTiAl alloy demonstrated excellent oxidation resistance with a 31.83 mg/cm² of specific mass gain after 48 h oxidation at 1000 °C in the air environment. Based on the multi-scale microstructural characterizations, a diffusion-controlled three-layers oxide scale model was proposed to explain the oxidation kinetics of this RHEA. In addition, thermodynamic calculation results shed light on the formation mechanism of the oxides based on the standard free energy of formation. The present work uncovered the oxidation-resistance mechanism of WTaNbTiAl RHEA via delicate microstructural analysis of oxides, which assists to guide the design of oxidation-resistant high entropy alloys.

Original language	English
Article number	110377
Journal	Corrosion Science
Volume	204
DOIs	https://doi.org/10.1016/j.corsci.2022.110377
State	Published - Aug 1 2022
Externally published	Yes

Funding

This work is supported by the Faculty Startup Fund in the School of Engineering at Alfred University . The Thermo Fisher Scientific (FEI) Scios™ 2 DualBeam ultra-high-resolution analytical FIB-SEM system is supported by the National Science Foundation under Grant No. 2018306 .

Funders	Funder number
National Science Foundation	2018306
Alfred University

Keywords

Oxidation mechanism
Oxidation resistance
Refractory high entropy alloys
Transmission electron microscopy

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10.1016/j.corsci.2022.110377

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title = "The oxidation-resistance mechanism of WTaNbTiAl refractory high entropy alloy",

abstract = "The WTaNbTiAl alloy demonstrated excellent oxidation resistance with a 31.83 mg/cm2 of specific mass gain after 48 h oxidation at 1000 °C in the air environment. Based on the multi-scale microstructural characterizations, a diffusion-controlled three-layers oxide scale model was proposed to explain the oxidation kinetics of this RHEA. In addition, thermodynamic calculation results shed light on the formation mechanism of the oxides based on the standard free energy of formation. The present work uncovered the oxidation-resistance mechanism of WTaNbTiAl RHEA via delicate microstructural analysis of oxides, which assists to guide the design of oxidation-resistant high entropy alloys.",

keywords = "Oxidation mechanism, Oxidation resistance, Refractory high entropy alloys, Transmission electron microscopy",

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AU - Yan, Yonggang

AU - McGarrity, Kade A.

AU - Delia, Daniel J.

AU - Fekety, Curtis

AU - Wang, Kun

PY - 2022/8/1

Y1 - 2022/8/1

N2 - The WTaNbTiAl alloy demonstrated excellent oxidation resistance with a 31.83 mg/cm2 of specific mass gain after 48 h oxidation at 1000 °C in the air environment. Based on the multi-scale microstructural characterizations, a diffusion-controlled three-layers oxide scale model was proposed to explain the oxidation kinetics of this RHEA. In addition, thermodynamic calculation results shed light on the formation mechanism of the oxides based on the standard free energy of formation. The present work uncovered the oxidation-resistance mechanism of WTaNbTiAl RHEA via delicate microstructural analysis of oxides, which assists to guide the design of oxidation-resistant high entropy alloys.

AB - The WTaNbTiAl alloy demonstrated excellent oxidation resistance with a 31.83 mg/cm2 of specific mass gain after 48 h oxidation at 1000 °C in the air environment. Based on the multi-scale microstructural characterizations, a diffusion-controlled three-layers oxide scale model was proposed to explain the oxidation kinetics of this RHEA. In addition, thermodynamic calculation results shed light on the formation mechanism of the oxides based on the standard free energy of formation. The present work uncovered the oxidation-resistance mechanism of WTaNbTiAl RHEA via delicate microstructural analysis of oxides, which assists to guide the design of oxidation-resistant high entropy alloys.

KW - Oxidation mechanism

KW - Oxidation resistance

KW - Refractory high entropy alloys

KW - Transmission electron microscopy

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The oxidation-resistance mechanism of WTaNbTiAl refractory high entropy alloy

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