Microstructural characterization and corrosion behaviour of AlCoCrFeNiTix high-entropy alloy coatings fabricated by laser cladding

Liu, Jian; Liu, Hao; Chen, Peijian; Hao, Jingbin

doi:10.1016/j.surfcoat.2019.01.044

Cited by 162 publications

(42 citation statements)

References 22 publications

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“…This also confirms the results of previous studies, because laser cladding has a higher cooling rate, the higher solidification rate is beneficial to the formation of BCC phase and improves the hardness. [6,12,26,27]. The introduction of Ti element can promote the passivation behavior of the coating due to the formation of TiO 2 and Ti 2 O 3 phases.…”

Section: Elementmentioning

confidence: 99%

“…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. The results proved that the introduction of Ti improves the corrosion resistance of the coating [12]. Zhang et al used laser cladding technology to prepare a FeCoCrAlNi HEA coating on 304 stainless steel, which exhibited good corrosion resistance and microhardness [13].…”

Section: Introductionmentioning

confidence: 97%

“…The commonly used processes for preparing alloy coatings are plasma spraying and high-velocity oxygen fuel (HVOF) spraying [9][10][11]. However, recently, the process of preparing alloy coating by laser cladding has become common [12,13]. Laser cladding is characterized by high energy density, fast heating and cooling rates, a lower heat effect on the base material, and a low dilution rate.…”

Section: Introductionmentioning

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: Elementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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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“…However, the present investigations in terms of HEAs mainly focus on the component optimization in different bulk HEAs prepared by the melting method. Some multicomponent systems have been explored (CrMnFeCoNi [27,28], CoCrCuFeNi [29,30], AlCoCrFeNi [31,32], AlCoCrFeNiTi [33,34] and so on [35,36]), among which AlCoCrFeNiTi attracts more attentions due to its higher plasticity/toughness, hardness and excellent corrosion resistance.However, there are few reports about the AlCoCrFeNiTi coatings prepared on titanium alloys (especially by laser cladding). Moreover, Cr as a main corrosion-resistant component in HEAs plays an essential role in improvement of corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

Zhang

Jiang

et al. 2020

Mater. Res. Express

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TiAlCoCr x FeNihigh-entropy alloys (HEAs) coatings were fabricated on the surface of Ti6Al4V by laser cladding. Their microstructural evolution with the increase in x value (x=0, x=1.0, x=2.0) was investigated in detail. Besides that, the investigation into the effects of the Cr content on their corrosion behaviors and mechanical properties (in terms of hardness and wear resistance) was also carried out comprehensively. The results indicated that two kinds of phases (a solid solution with thehexagonal close-packed (HCP) structureand Ti 2 Ni) were synthesized in the coatings, and the HCP content was gradually increased with the increase in x accompanied with the decrease in Ti 2 Ni content. A HEA coating only composed of single HCP was successfully prepared when x reached 2.0. The electrochemical and immersion tests all confirmed that the coating with x=2.0demonstrated the most excellent corrosion resistance in a0.1 mol·L −1 HCl solution from different aspects including corrosion tendency and corrosion rate without the applied potential, the formation difficult/stability of the passive film and the dissolution rate in the passive state, and corrosion surface morphology. The averagemicrohardness values of the coatings weregraduallyincreasedfrom 656HV 0.2 to 800 HV 0.2 with increasing xfrom 0 to 2.0, which wereabout double that of the substrate (350 HV 0.2 ). Wear resistance of the coatings also exhibited the upward tendency with increasing the x values (0.562 mm 3 at x=2.0, 0.640 mm 3 at x=1.0, 0.641 mm 3 at x=0 and 1.419 mm 3 for the substrate). More Cr addition into the cladding material will contribute to the formation of a HEA coating composed of single HCPwith excellent corrosion and wear resistance.

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Microstructure and corrosion behavior of FeCrNiMnMo_x high‐entropy alloys fabricated by the laser surface remelting

Hu¹,

Liu²,

Li³

2020

Materials & Corrosion

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In this study, an Nd:YAG laser was used to carry out laser surface remelting treatment on FeCrNiMnMo x (x = 0, 0.5, 1) alloys. A study was conducted on the potential impact of Mo on the microstructure and corrosion resistance of the laser-remelted layer. According to the research results, FeCrNiMnMo x alloys were more effective in refining the dendrites, compared with the matrix, whereas the FeCrNiMn alloys' remelted layer exhibited an almost single face-centered cubic (FCC) structure. In comparison, FeCrNiMnMo 0.5 and FeCrNiMnMo 1 alloys' remelted layer displayed the FCC and σ phase. In addition, the dendrite crystals' microstructure can be clearly refined by Mo alloying. Mo is effective in improving the corrosion resistance of the FeCrNiMnMo x alloys' remelted layer in 3.5% NaCl solution. The pitting resistance of Mo-containing-remelted layers is significantly higher, compared with Mo-free alloy's remelted layer, and the FeCrNiMnMo 0.5remelted layer shows the most satisfactory corrosion resistance. As revealed by X-ray photoelectron spectroscopy analyses, the addition of molybdenum promotes the generation of Cr 2 O 3 and enhances the corrosion resistance of the remelted layer.

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Microstructural characterization and corrosion behaviour of AlCoCrFeNiTix high-entropy alloy coatings fabricated by laser cladding

Cited by 162 publications

References 22 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

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

Microstructure and corrosion behavior of FeCrNiMnMo_x high‐entropy alloys fabricated by the laser surface remelting

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Microstructural characterization and corrosion behaviour of AlCoCrFeNiTix high-entropy alloy coatings fabricated by laser cladding

Cited by 162 publications

References 22 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

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

Microstructure and corrosion behavior of FeCrNiMnMox high‐entropy alloys fabricated by the laser surface remelting

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Microstructure and corrosion behavior of FeCrNiMnMo_x high‐entropy alloys fabricated by the laser surface remelting