Oxidation behaviour of a novel refractory high entropy alloy at elevated temperatures

Lo, Kai Chi; Murakami, Hideyuki; Yeh, Jien Wei; Yeh, An‐Chou

doi:10.1016/j.intermet.2020.106711

Cited by 47 publications

(20 citation statements)

References 25 publications

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“…Supports the formation of complex oxides with high solubility of different metal cations [26,34] -Min: 5.4 at% [30,31] Max: 37.5 at% [25] Al Al 2 O 3 former Reduces oxidation kinetics [27] -Min: 8.62 at% [34] Max: 35 at% [32] Cr Cr 2 O 3 and CrTaO 4 former [26] Neutralize the presence of -Min: 10 at% [27] Max: 30 at% [27] Si Prevents the formation of V oxides Facilitates the formation of alumina scale [34] Reduces nitridation [30] -Min: 1 at% [35] Max: 24 at% [32] -Y Improves scale adherence [46] -Min: 0.5 at% [46] Max: 1 at% [60] due to Al 2 O 3 scales to dramatic phenomenon such as pesting. Hence, four major development directions may be pursued in future work.…”

Section: Timentioning

confidence: 96%

“…However, a pronounced zone of internal corrosion is usually detected below the CrTaO 4 layers. [26,[29][30][31] Only one alloy oxidizes according to type 4). A fully continuous and protective Al 2 O 3 scale was observed on the alloy Nb 1.3 Si 2.4 Ti 2.4 Al 3.5 Hf 0.4 after oxidation for 100 h at 1200 C (see Figure 4d).…”

Section: Oxidation Behavior Of Rm Rm-based Alloys and Intermetallic Compoundsmentioning

confidence: 99%

“…Besides the four RM, i.e., Mo, Nb, V, and Ta, the composition of a typical RHEA includes Ti, Cr, Zr, Hf, and Al. Only few RHEA additionally contain Si [30][31][32]35] or Y. [46] Table 7 summarizes the key features of these elements and their main impacts on the oxidation resistance.…”

Section: Role Of Specific Alloying Elementsmentioning

confidence: 99%

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Current Status of Research on the Oxidation Behavior of Refractory High Entropy Alloys

Gorr¹,

et al. 2021

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Figure 4. Cross sections of various RHEA after oxidation in air (conditions in brackets): a) surface oxide layer (SOL) of the alloy TiZrNbHfTa(1 h at 700 C), [35] ODZ represents the oxygen diffusion zone. Reproduced with permission. [24] Copyright 2018, Wiley. b) Oxide scale formed on the alloy NbMoCrTiAl (100 h at 1000 C) [21] (mixed oxides consists of Nb 2 O 5 , TiO 2 , Cr 2 O 3 , Al 2 O 3 , and CrNbO 4 ). Reproduced with permission. [26] Copyright 2019, Elsevier. c) Backscattered electron (BSE) image of the alloy TaMoCrTiAl (100 h at 1000 C). [21] Reproduced with permission. [26] Copyright 2019, Elsevier. d) BSE image of an α-alumina scale formed on the alloy Nb1.3Si2.4Ti2.4Al3.5Hf0.4 (100 h at 1200 C). [28] Reproduced under the terms of the CC BY 4.0 license. [32] Copyright 2019, The Authors. Published by MDPI. Figure 3. Oxide scales formed on two equiatomic RHEA after 24 h of oxidation at 1200 C; a) MoCrTiAl and b) TaMoCrTiAl.

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Section: Timentioning

confidence: 96%

Section: Oxidation Behavior Of Rm Rm-based Alloys and Intermetallic Compoundsmentioning

confidence: 99%

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Current Status of Research on the Oxidation Behavior of Refractory High Entropy Alloys

Gorr¹,

et al. 2021

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“…Some RHEAs indeed possess outstanding mechanical properties above 1200 °C [3,4] on which most studies were focused in the past. Much less attention has been paid to oxidation resistance of RHEA [5][6][7][8][9] though this feature is commonly known as one of the major drawbacks of refractory metals and refractory metal-based alloys. Recently, several RHEAs were reported to possess a relatively high level of oxidation resistance due to the formation of compact CrTaO 4 scales [6][7][8]10].…”

Section: Introductionmentioning

confidence: 99%

“…Much less attention has been paid to oxidation resistance of RHEA [5][6][7][8][9] though this feature is commonly known as one of the major drawbacks of refractory metals and refractory metal-based alloys. Recently, several RHEAs were reported to possess a relatively high level of oxidation resistance due to the formation of compact CrTaO 4 scales [6][7][8]10]. The rutile-type CrTaO 4 oxide forms by the reaction Cr 2 O 3 + Ta 2 O 5 → 2CrTaO 4 [11,12], which is decisive in terms of the oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Al on the Formation of a CrTaO4 Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl

Schellert

Gorr²,

Christ

et al. 2021

Oxid Met

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In this study, the effect of Al on the high temperature oxidation of Al-containing refractory high entropy alloys (RHEAs) Ta-Mo-Cr-Ti-xAl (x = 5; 10; 15; 20 at%) was examined. Oxidation experiments were performed in air for 24 h at 1200 °C. The oxidation kinetics of the alloy with 5 at% Al is notably affected by the formation of gaseous MoO3 and CrO3, while continuous mass gain was detected for alloys with the higher Al concentrations. The alloys with 15 and 20 at% Al form relatively thin oxide scales and a zone of internal corrosion due to the formation of dense CrTaO4 scales at the interface oxide/substrate. The alloys with 5 and 10 at% Al exhibit, on the contrary, thick and porous oxide scales because of fast growing Ta2O5. The positive influence of Al on the formation of Cr2O3 followed by the growth of CrTaO4 to yield a compact scale is explained by getter and nucleation effects.

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Elemental Influence on Oxidation Behaviour of Cantor‐Based and Refractory High Entropy Alloys: A Critical Review

Dehury,

Kumar,

Joshi

et al. 2024

Adv Eng Mater

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This article reviews the oxidation behaviour of the two most significant high entropy alloy systems (HEAs) namely Cantor‐based and refractory HEAs. HEAs have been extensively researched and show potential applications in various industries, including marine engine manufacturing, chemical industry, furnaces, ducting, heat exchangers, jet engines, steam turbines, nuclear reactors and electronic devices, among others. Effect of the presence of elements such as aluminium, manganese, chromium, silicon, tantalum, vanadium etc. are studied for catalysing the oxidation of HEAs. Aluminium, chromium and silicon are reportedly found to considerably impact the oxidation kinetics and enhance the oxidation resistance. However, silicon can positively or adversely affect the oxidation resistance depending on its concentration and alloy composition. Other elements like manganese tend to adversely impact the oxidation resistance of FeCoNi‐based HEAs. Refractory elements are typically found to be not suitable for oxidation studies due to the formation of non‐protective oxide layers. However, refractory HEAs offer interesting trends both in terms of enhancing or reducing oxidation resistance depending on the alloying elements. Similarly, findings related to other elements are also presented and elaborated.This article is protected by copyright. All rights reserved.

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Oxidation behaviour of a novel refractory high entropy alloy at elevated temperatures

Cited by 47 publications

References 25 publications

Current Status of Research on the Oxidation Behavior of Refractory High Entropy Alloys

Current Status of Research on the Oxidation Behavior of Refractory High Entropy Alloys

The Effect of Al on the Formation of a CrTaO4 Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl

Elemental Influence on Oxidation Behaviour of Cantor‐Based and Refractory High Entropy Alloys: A Critical Review

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