Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

Yurchenko, N.; Panina, E.; Zherebtsov, Sergey; Салищев, Г. А.; Stepanov, Nikita

doi:10.3390/ma11122526

Cited by 41 publications

(17 citation statements)

References 64 publications

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“…Less data are available for 1300 °C and the data are for up to 50 h. There is one study at 800 °C. Data for the oxidation of RCCAs in the pest regime is rare and papers do not indicate whether the RCCAs experienced pest oxidation, albeit with some exceptions, for example the alloy AlNbTiVZr 0.25 disintegrated after 50 h at 900 °C [ 56 ]. Only the oxidation of one RCCA is directly comparable with the alloys JZ3 and JZ3+.…”

Section: Discussionmentioning

confidence: 99%

On the Microstructure and Properties of Nb-12Ti-18Si-6Ta-5Al-5Cr-2.5W-1Hf (at.%) Silicide-Based Alloys with Ge and Sn Additions

2020

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The microstructures and properties of the alloys JZ3 (Nb-12.4Ti-17.7Si-6Ta-2.7W-3.7Sn-4.8Ge-1Hf-4.7Al-5.2Cr) and JZ3+(Nb-12.4Ti-19.7Si-5.7Ta-2.3W-5.7Sn-4.9Ge-0.8Hf-4.6Al-5.2Cr) were studied. The densities of both alloys were lower than the densities of Ni-based superalloys and many of the refractory metal complex concentrated alloys (RCCAs) studied to date. Both alloys had Si macrosegregation and the same phases in their as cast and heat treated microstructures, namely βNb5Si3, αNb5Si3, A15-Nb3X (X = Al, Ge, Si, Sn), C14-Cr2Nb and solid solution. W-rich solid solutions were stable in both alloys. At 800 °C only the alloy JZ3 did not show pest oxidation, and at 1200 °C a thin and well adhering scale formed only on JZ3+. The alloy JZ3+ followed parabolic oxidation with rate constant one order of magnitude higher than the single crystal Ni-superalloy CMSX-4 for the first 14 h of oxidation. The oxidation of both alloys was superior to that of RCCAs. Both alloys were predicted to have better creep at the creep goal condition compared with the superalloy CMSX-4. Calculated Si macrosegregation, solid solution volume fractions, chemical compositions of solid solution and Nb5Si3, weight changes in isothermal oxidation at 800 and 1200 °C using the alloy design methodology NICE agreed well with the experimental results.

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Section: Discussionmentioning

confidence: 99%

On the Microstructure and Properties of Nb-12Ti-18Si-6Ta-5Al-5Cr-2.5W-1Hf (at.%) Silicide-Based Alloys with Ge and Sn Additions

2020

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“…The RHEA reviewed in this article revealed a broad spectrum of oxidation resistance ranging from the high protectiveness [25] Min: 4 at% [32] Max: 20 at% [24] Mo -Volatile MoO 3 above 795 C [26,27] Min: 10 at% [21] Max: 33.4 at% [33] Nb -Forms polymorphic oxides [26] Min: 12.5 at% [25] Max: 30 at% [28] Ta Increases the temperature required to form Nb 2 O 5 [28] CrTaO 4 former [2930] -Min: 10 at% [21] Max: 33.4 at% [33] V -Volatile V 2 O 5 above 678 C [34,58] Min: 17.24 at% [34] Max: 25 at% [43] W -Volatile WO 3 above 1000 C [55] 20 at% [55] Zr -Forms fast growing ZrO 2 Supports pesting by increasing the volume of the oxides [25] Min: 5.9 at% [58] Max: 25 at% [25,43,57]…”

Section: Future Research and Development Directionsmentioning

confidence: 99%

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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“…There are a number of studies of the behavior of refractory HEAs during high-temperature oxidation [ 49 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 ]. The most interesting results are given below; the role of aluminum in oxidation resistance should be noted.…”

Section: High-entropy Alloys From Refractory Metalsmentioning

confidence: 99%

High-Temperature Oxidation of High-Entropic Alloys: A Review

et al. 2021

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Over the past few years, interest in high-entropic alloys (HEAs) has been growing. A large body of research has been undertaken to study aspects such as the microstructure features of HEAs of various compositions, the effect of the content of certain elements on the mechanical properties of HEAs, and, of course, special properties such as heat resistance, corrosion resistance, resistance to irradiation with high-energy particles, magnetic properties, etc. However, few works have presented results accumulated over several years, which can complicate the choice of directions for further research. This review article presents the results of studies of the mechanisms of high-temperature oxidation of HEAs of systems: Al-Co-Cr-Fe-Ni, Mn-Co-Cr-Fe-Ni, refractory HEAs. An analysis made it possible to systematize the features of high-temperature oxidation of HEAs and propose new directions for the development of heat-resistant HEAs. The presented information may be useful for assessing the possibility of the practical application of HEAs in the aerospace industry, in nuclear and chemical engineering, and in new areas of energy.

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Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

Cited by 41 publications

References 64 publications

On the Microstructure and Properties of Nb-12Ti-18Si-6Ta-5Al-5Cr-2.5W-1Hf (at.%) Silicide-Based Alloys with Ge and Sn Additions

On the Microstructure and Properties of Nb-12Ti-18Si-6Ta-5Al-5Cr-2.5W-1Hf (at.%) Silicide-Based Alloys with Ge and Sn Additions

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

High-Temperature Oxidation of High-Entropic Alloys: A Review

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