Effect of remelting and annealing on the wear resistance of AlCoCrFeNiTi0.5 high entropy alloys

Dejun, Kong; Guo, Jingjie; Liu, Ruiwen; Zhang, Xiaohui; Song, Yuepeng; Li, Zongxi; Guo, Fengjiang; Xing, Xiangfeng; Yang, Xu; Wang, Wei

doi:10.1016/j.intermet.2019.106560

Cited by 50 publications

(16 citation statements)

References 24 publications

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“…The from the chains of elongated GB particles (incomplete GB wetting). The AlCoCrFeNiTi0.5 HEA ingots were prepared by the arc melting method in the argon atmosphere [65]. The as-cast state contained the simple solid solution based on bcc as the main phase.…”

Section: Gb Wetting By Second Solid Phase In Primarily Inhomogeneous ...mentioning

confidence: 99%

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

et al. 2021

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In this review, the phenomenon of grain boundary (GB) wetting by the second solid phase is analyzed for the high entropy alloys (HEAs). Similar to the GB wetting by the liquid phase, the GB wetting by the second solid phase can be incomplete (partial) or complete. In the former case, the second solid phase forms in the GB of a matrix, the chain of (usually lenticular) precipitates with a certain non-zero contact angle. In the latter case, it forms in the GB continuous layers between matrix grains which completely separate the matrix crystallites. The GB wetting by the second solid phase can be observed in HEAs produced by all solidification-based technologies. The particle chains or continuous layers of a second solid phase form in GBs also without the mediation of a liquid phase, for example by solid-phase sintering or coatings deposition. To describe the GB wetting by the second solid phase, the new GB tie-lines should be considered in the two- or multiphase areas in the multicomponent phase diagrams for HEAs. The GB wetting by the second solid phase can be used to improve the properties of HEAs by applying the so-called grain boundary engineering methods.

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Section: Gb Wetting By Second Solid Phase In Primarily Inhomogeneous ...mentioning

confidence: 99%

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

et al. 2021

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“…As the configurational entropy of the alloy increases from the mixing of various powders at nearly equal molar ratios, the alloy tends to form a simple crystal structure with lower free energy in high temperature reactions. This inhibits the high formation enthalpy of fusion intermetallic compounds with complex phase structure [26]. Eventually, the number of phases reduced.…”

Section: Resultsmentioning

confidence: 99%

Microstructure, mechanical, and corrosion resistance properties of Al_0.8CrFeCoNiCu_x high-entropy alloy coatings on aluminum by laser cladding

Shi

Olugbade

2020

Mater. Res. Express

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High-entropy alloys (HEAs) were used to improve the hardness, wear resistance, and corrosion resistance of steel surfaces by laser cladding due to their outstanding mechanical and corrosion resistance properties. However, there are only a few literary works on the improvement of wear resistance on the aluminum alloy surface by HEAs. In this work, the wear performance of laser cladded Al 0.8 CrFeNiCoAlCu x HEA coating on aluminum alloy with different Cu contents was investigated in detail. Moreover, phase structure, microstructure, bonding shear strength, and corrosion resistance of HEA coatings were studied by XRD, SEM, tensile device, and electrochemical workstation. The result shows that with the increase of the Cu content, the structure of the coatings changed from BCC1 and BCC2 phases to BCC1, BCC2, and FCC1 phases. Evident cracks were observed in the Al 0.8 CrFeCoNi HEA coating. Meanwhile, when x=0.25, the cracks disappeared, but the bonding shear strength was 79.6 MPa, only 34.7% of the substrate. At 0.5x1, the bonding shear strength of the Al 0.8 CrFeCoNiCu x HEA coatings went above 175.2 MPa. As Cu promotes the formation of FCC phase, the hardness of the Al 0.8 CrFeCoNiCu x HEA coating decreased as the Cu content increased. The effect of Cu on wear resistance has the same trend as with hardness. The wear rate of Al 0.8 CrFeCoNiCu 0.5 , Al 0.8 CrFeCoNiCu 0.75 , and Al 0.8 CrFeCoNiCu HEA alloys is only 3.4%, 4.02%, and 5.42%, respectively, of the substrate. The wear mechanisms of the substrate are that of delamination fracture and serious adhesion wear, while the wear mechanisms of Al 0.8 CrFeCoNiCu x (0.5x1) HEA coatings are that of adhesive and abrasive wear. The corrosion resistance of Al 0.8 CrFeCoNiCu x (0.5x1) HEA is better than that of the substrate in 1 mol l −1 H 2 SO 4 solution. Al 0.8 CrFeCoNiCu 0.5 has the best corrosion resistance that is characterized by pitting and intergranular corrosion.OPEN ACCESS RECEIVED increase the cracking sensitivity and affect the performance of the coating [7-10]. Therefore, the preparation of coatings on aluminum alloy has always been a problem in the field of LC.High-entropy alloy (HEA) has persistently been a hot research subject in the field of materials science [11][12][13], since it was developed in 2004. HEA is generally defined as alloys formed by five or more elements with a molar ratio between 5% and 35% and having an entropy greater than 11. RJ mol −1 ·K −1 [14]. HEAs have high strength and hardness, good corrosion resistance, and excellent thermal stability [15]. Khan et al [16] prepared a film of AlCrFeCoNiCu 0.5 HEA using magnetron sputtering technology and found that the alloy had an FCC and BCC dual-phase structure and a hardness value of 13 GPa. Luo et al [17] prepared the WC+Al x CrFeCoNiCu (0x1.5) composite by mixing WC with Al, Cr, Fe, Co, Ni, and Cu powders, by plasma sintering. Due to slow diffusion effect, the WC particles dispersed in the solid solution phase of HEA, and the WC+Al 0.5 CrFeCoNiCu composite exhibited a ...

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“…Thus, the temperature interval where GB TJs are wetted is broader than that for GBs. Some indications of GB wetting by the second solid phase (such as the observed thick continuous GB layers) can also be found in numerous metallic HEAs such as Al 0.5 CoCuNiTi [9], TiZrNbHfTa [87,88], CrHfNbTaTi [10], TiNbTaZrMo [89], Mo 0.5 VNb TiCr x [27], Co 35 Cr 32 Ni 27 -Al 3 Ti 3 [17], AlCoCrFeNiTi 0.5 [90], CoCrFeMnNi [36], Co 35 Cr 25 Fe 40−x Ni x [91], TiNbTa 0.5 ZrAl 0.5 [92], and CoNiAlWTaTi [93].…”

Section: Grain Boundary Wetting Phenomenamentioning

confidence: 87%

Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

et al. 2021

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In this review, we analyze the structure of multicomponent alloys without principal components (they are also called high entropy alloys—HEAs), containing not only metals but also hydrogen, nitrogen, carbon, boron, or silicon. In particular, we discuss the phenomenon of grain boundary (GB) wetting by the melt or solid phase. The GB wetting can be complete or incomplete (partial). In the former case, the grains of the matrix are completely separated by the continuous layer of the second phase (solid or liquid). In the latter case of partial GB wetting, the second solid phase forms, between the matrix grains, a chain of (usually lenticular) precipitates or droplets with a non-zero value of the contact angle. To deal with the morphology of GBs, the new GB tie-lines are used, which can be constructed in the two- or multiphase areas of the multidimensional HEAs phase diagrams. The GBs in HEAs in the case of complete or partial wetting can also contain hydrides, nitrides, carbides, borides, or silicides. Thus, GB wetting by the hydrides, nitrides, carbides, borides, or silicides can be used in the so-called grain boundary chemical engineering in order to improve the properties of respective HEAs.

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Effect of remelting and annealing on the wear resistance of AlCoCrFeNiTi0.5 high entropy alloys

Cited by 50 publications

References 24 publications

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Microstructure, mechanical, and corrosion resistance properties of Al_0.8CrFeCoNiCu_x high-entropy alloy coatings on aluminum by laser cladding

Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

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Effect of remelting and annealing on the wear resistance of AlCoCrFeNiTi0.5 high entropy alloys

Cited by 50 publications

References 24 publications

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Grain Boundary Wetting by a Second Solid Phase in the High Entropy Alloys: A Review

Microstructure, mechanical, and corrosion resistance properties of Al0.8CrFeCoNiCux high-entropy alloy coatings on aluminum by laser cladding

Grain Boundary Wetting Phenomena in High Entropy Alloys Containing Nitrides, Carbides, Borides, Silicides, and Hydrogen: A Review

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Microstructure, mechanical, and corrosion resistance properties of Al_0.8CrFeCoNiCu_x high-entropy alloy coatings on aluminum by laser cladding