Effect of Al content on high temperature oxidation resistance of AlxCoCrCuFeNi high entropy alloys (x=0, 0.5, 1, 1.5, 2)

Liu, Y.Y.; Chen, Z.; Chen, Y.Z.; Shi, Jinhong; Wang, Z.Y.; Wang, S.; Liu, F.

doi:10.1016/j.vacuum.2019.108837

Cited by 98 publications

(20 citation statements)

References 34 publications

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“…It has been reported that the addition of Al can change the phase constitution and the microstructure of HEA [16][17][18]. Figure 8a displays the TEM bright-field image of the Al 0.5 coating.…”

Section: Discussionmentioning

confidence: 99%

“…As reported, the key factor affecting the alloying behavior and properties of HEA is its elemental composition design. Al and Ti have been investigated in many articles involving HEA due to the larger atomic radius and characteristics of these elements having greater impact on the structural property characteristic of HEAs [12,[16][17][18][19]. Liu et al prepared an AlCoCrFeNiTi x (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) coating on AISI1045 steel by laser cladding technology and studied the corrosion behavior of the HEA coating in a 3.5 wt.% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Properties of Laser Cladding CoCrFeNiTiAlx High-Entropy Alloy Coatings

Jianru

et al. 2020

Coatings

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High-entropy alloy (HEA) coatings of CoCrFeNiTiAlx (x = 0, 0.5, 1, 1.5, 2) were prepared on the surface of AISI1045 steel by laser cladding. The effects of the Al content on the microstructure, composition, phase constitution, and wear and corrosion resistance of the coatings were investigated. The results showed that when increasing the Al element content from 0 to 0.5, the phase constitution of the CoCrFeNiTiAlx coating changed from a single Face-centered cubic (FCC) phase to Body-centered cubic 1 (BCC1) and Body-centered cubic 2 (BCC2) phases, with a small amount of Laves phase, which obviously improved the friction and corrosion resistance of the coating. With further enhancing of the Al content, the amount of BCC1 phase increased, while the BCC2 phase and the Laves phase decreased. The CoCrFeNiTiAl2 HEA coating transformed into a single BCC1 phase, with retrogressive wear and corrosion resistance. It was found that the Al0.5 alloy coating exhibits excellent wear resistance, high hardness, and corrosion resistance in a 3.5 wt.% NaCl solution. Furthermore, the effect of the Al content on the microstructure, phase, and the relating properties of the CoCrFeNiTiAlx HEA coatings is also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Properties of Laser Cladding CoCrFeNiTiAlx High-Entropy Alloy Coatings

Jianru

et al. 2020

Coatings

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“…The high temperature oxidation resistance of the AlxCoCrCuFeNi (x = 0, 0.5, 1, 1.5, 2) high-entropy alloy was studied. The results show that the oxidation resistance of the Al 2 CoCrCuFeNi alloy is the best among the five HEAs [ 19 ]. A previous report has indicated that the crystal structure of CoCrCuFeNiTix is: FCC (x = 0, 0.5) and FCC + Laves phases (x = 0.8, 1).…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of FeCoCrNiCuTi0.8 High-Entropy Alloy Prepared by Directional Solidification

Huang

et al. 2020

Entropy

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A CoCrCuFeNiTi0.8 high-entropy alloy was prepared using directional solidification techniques at different withdrawal rates (50 μm/s, 100 μm/s, 500 μm/s). The results showed that the microstructure was dendritic at all withdrawal rates. As the withdrawal rate increased, the dendrite orientation become uniform. Additionally, the accumulation of Cr and Ti elements at the solid/liquid interface caused the formation of dendrites. Through the measurement of the primary dendrite spacing (λ1) and the secondary dendrite spacing (λ2), it was concluded that the dendrite structure was obviously refined with the increase in the withdrawal rate to 500 μm/s. The maximum compressive strength reached 1449.8 MPa, and the maximum hardness was 520 HV. Moreover, the plastic strain of the alloy without directional solidification was 2.11%, while the plastic strain of directional solidification was 12.57% at 500 μm/s. It has been proved that directional solidification technology can effectively improve the mechanical properties of the CoCrCuFeNiTi0.8 high-entropy alloy.

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“…While CCAs exhibit sufficiently high melting points and phase stability for demanding applications, they however remain dependent on the formation of a reliable protective oxide scale for continuity of usage, which is no different to "traditional" Fe-and Ni-base alloys. At present, there is insufficient knowledge regarding high-temperature oxidation behaviour of CCAs more generally, with relatively few studies reported such properties [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A literature survey of the limited research within the context of oxidation of CCAs at temperatures ranging from 500 to 1200°C is provided in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…An appraisal of the literature (Table 1 and Fig. 1) reveals that (i) the high-temperature oxidation of only a very limited number of CCAs have, to date, been studied, with the majority of studies focusing on either the CoCrFeNiX (X = Al, Mn, Si) [6,10,11] or MoCrTiAlY (Y = W, Nb, Ta) [14] systems, (ii) the two essential alloying elements, Cr [9] and Al [10], positively influence the oxidation properties of CCAs, and (iii) the surface oxide forming on CCAs containing Mn [10,16] and Cu [21] are prone to failure e.g. cracking and spallation, due to the formation of Mn-rich oxides.…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

Esmaily¹,

Qiu²,

Bigdeli³

et al. 2020

Preprint

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Compositionally complex alloys (CCAs), also termed as high entropy alloys (HEAs) or multiprincipal element alloys (MPEAs), are being considered as a potential solution for many energyrelated applications comprising extreme environments and temperatures. Herein, a review of the pertinent literature is performed in conjunction with original works characterising the oxidation behaviour of two "opposing" alloys; namely a lightweight (5.06 g/cm 3 ) single-phase AlTiVCr CCA and a multiple-phase Al0.9FeCrCoNi CCA (6.9 g/cm 3 ). The thermogravimetric results obtained during oxidation of the alloys at 700 and 900°C revealed that while AlTiVCr revealed linear oxidation, Al0.9FeCrCoNi tended to obey the desired parabolic rate law. However, postexposure analysis by means of electron microscopy indicated that while the oxide scale formed on the AlTiVCr is adherent to the substrate, the scale developed on the Al0.9FeCrCoNi displays a notable spalling propensity. This study highlights the need for tailoring the protective properties of the oxide scale formed on the surface of the CCAs.

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Effect of Al content on high temperature oxidation resistance of AlxCoCrCuFeNi high entropy alloys (x=0, 0.5, 1, 1.5, 2)

Cited by 98 publications

References 34 publications

Microstructure Evolution and Properties of Laser Cladding CoCrFeNiTiAlx High-Entropy Alloy Coatings

Microstructure Evolution and Properties of Laser Cladding CoCrFeNiTiAlx High-Entropy Alloy Coatings

Microstructure Evolution and Mechanical Properties of FeCoCrNiCuTi0.8 High-Entropy Alloy Prepared by Directional Solidification

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

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