Laser additive synthesis of high entropy alloy coating on aluminum: Corrosion behavior

Shon, Youkang; Joshi, Sameehan S.; Katakam, Shravana; Rajamure, Ravi Shanker; Dahotre, Narendra B.

doi:10.1016/j.matlet.2014.11.161

Cited by 123 publications

(43 citation statements)

References 24 publications

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“…Finally, the cladding layer cracks along the intergranular. A similar appearance occurs in the laser cladded AlCrFeCoNi HEA coating on pure aluminum by Shon et al [28]. Notably, the Al content of the samples is generally higher than the nominal composition (table 3), indicating that the Al in the substrate floats towards the coating during LC.…”

Section: Resultssupporting

confidence: 71%

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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Section: Resultssupporting

confidence: 71%

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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“…However, if the scan speed was too fast, the rough cladding layer surface led to poor corrosion resistance. The effects of energy input and layer number on the corrosion behavior of the CoCrFeNi coating was studied [33]. With Al as the substrate, the higher energy input combined with the multi-layered coating could reduce the dilution from the substrate (which leads to the formation of the heterogeneous composition and microstructure), and, therefore, enhanced the formation of HEAs throughout the coating, avoided the local micro-galvanic cell formation, and resulted in the superior corrosion resistance in the 3.5 wt % NaCl solution [33].…”

Section: Coating By Laser Claddingmentioning

confidence: 99%

“…The effects of energy input and layer number on the corrosion behavior of the CoCrFeNi coating was studied [33]. With Al as the substrate, the higher energy input combined with the multi-layered coating could reduce the dilution from the substrate (which leads to the formation of the heterogeneous composition and microstructure), and, therefore, enhanced the formation of HEAs throughout the coating, avoided the local micro-galvanic cell formation, and resulted in the superior corrosion resistance in the 3.5 wt % NaCl solution [33]. The proper selection of processing parameters, including the laser power, scanning speed, and laser spot radius led to the successful AlCoCrFeNi HEA coating with a simple BCC phase on the 304 stainless steel [38].…”

Section: Coating By Laser Claddingmentioning

confidence: 99%

Corrosion-Resistant High-Entropy Alloys: A Review

Shi

Yang

Liaw

2017

Metals

653

205

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Corrosion destroys more than three percent of the world's gross domestic product. Therefore, the design of highly corrosion-resistant materials is urgently needed. By breaking the classical alloy-design philosophy, high-entropy alloys (HEAs) possess unique microstructures, which are solid solutions with random arrangements of multiple elements. The particular locally-disordered chemical environment is expected to lead to unique corrosion-resistant properties. In this review, the studies of the corrosion-resistant HEAs during the last decade are summarized. The corrosion-resistant properties of HEAs in various aqueous environments and the corrosion behavior of HEA coatings are presented. The effects of environments, alloying elements, and processing methods on the corrosion resistance are analyzed in detail. Furthermore, the possible directions of future work regarding the corrosion behavior of HEAs are suggested.

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“…31 The clads were made with a scanning speed of 5 mm/s on a stainless steel bar substrate with a 50 mm diameter. In all cases, a 50% laser track overlap was used to create continuous coatings, and up to three layers of the coatings were built to eliminate compositional change by dilution 32,33 from the substrate. Equimolar mixtures of elemental powders with purity higher than 99.9% were fed using argon as a carrier gas into the melt pool created by a defocused laser beam (diameter of Gaussian beam of about 2.3 mm).…”

Section: Laser-deposited Alcocrfeni and Alcrfenita Heasmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

129

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This contribution concentrates on the possibilities of additive manufacturing of high-entropy clad layers by laser processing. In particular, the effects of the laser surface processing parameters on the microstructure and hardness of high-entropy alloys (HEAs) were examined. AlCoCrFeNi alloys with different amounts of aluminum prepared by arc melting were investigated and compared with the laser beam remelted HEAs with the same composition. Attempts to form HEAs coatings with a direct laser deposition from the mixture of elemental powders were made for AlCoCrFeNi and AlCrFeNiTa composition. A strong influence of solidification rate on the amounts of face-centered cubic and bodycentered cubic phase, their chemical composition, and spatial distribution was detected for two-phase AlCoCrFeNi HEAs. It is concluded that a high-power laser is a versatile tool to synthesize interesting HEAs with additive manufacturing processing. Critical issues are related to the rate of (re)solidification, the dilution with the substrate, powder efficiency during cladding, and differences in melting points of clad powders making additive manufacturing processing from a simple mixture of elemental powders a challenging approach.

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Laser additive synthesis of high entropy alloy coating on aluminum: Corrosion behavior

Cited by 123 publications

References 24 publications

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

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

Corrosion-Resistant High-Entropy Alloys: A Review

Additive Manufacturing of High-Entropy Alloys by Laser Processing

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Laser additive synthesis of high entropy alloy coating on aluminum: Corrosion behavior

Cited by 123 publications

References 24 publications

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

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

Corrosion-Resistant High-Entropy Alloys: A Review

Additive Manufacturing of High-Entropy Alloys by Laser Processing

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Product

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

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