Evolution in microstructure and corrosion behavior of AlCoCrxFeNi high-entropy alloy coatings fabricated by laser cladding

Jiang, Yunqiang; Li, J.; Juan, Yongfei; Lü, Zan; Jia, Wanli

doi:10.1016/j.jallcom.2018.10.091

Cited by 155 publications

(46 citation statements)

References 42 publications

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“…The cross-sectional profile of the coating can be considered as a combination of an ideal arc and a rectangle (figure 2). Therefore, S 1 and S 2 can be calculated according to the geometric relationship [38]: where H 1 and H 2 represent the depths of the coating below and above the surface of the substrate, respectively, W denotesthe width of the coating. Based onthe measured values of H 1 , H 2 and W,the dilution rates of three coatingswere calculated according to equations (1)- (3).…”

Section: Resultsmentioning

confidence: 99%

“…Zhang et al [39] proposed the criterions based on a large number of data obtained from numerous prepared HEAs, namely the simple solid solutions can be synthesized when they satisfy 12ΔS mix 17.5 J·K −1 ·mol −1 , −19ΔH mix 5 kJ·mol −1 , 0δ6.5. The similar criterions were also established by Guo et al [40], which are followed: The above parameters were defined as following [38]:…”

Section: Resultsmentioning

confidence: 99%

“…It is clear that the calculations of the three parameters are closely related to the contents of different elements in HEAs. The components involved in the laser-clad HEAs coatings are derived from two parts, corresponding to the cladding materials (AlCoCr x NiFe) and the substrate (Ti6Al4V).A model had been established to calculate the contents of those components [38]. Based on that, the contents of all components in the three coatings were calculated (shown in table 2).…”

Section: Xrd Analysesmentioning

confidence: 99%

“…The SLM Ni). Moreover, the total content of Cr involved in the coatings is gradually increased with the increase in x. Cr had been proved to play the positive role in improvement in corrosion resistance of the alloys [38]. Therefore, the evolution in phase constituent and corresponding chemical composition with x can be regarded as an important factor causing the increase in corrosion resistance of the coatings.…”

Section: Corrosion Behaviors 321 Electrochemical Testsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Xrd Analysesmentioning

confidence: 99%

Section: Corrosion Behaviors 321 Electrochemical Testsmentioning

confidence: 99%

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

Zhang

Jiang

et al. 2020

Mater. Res. Express

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“…Due to their simple solid solution structure, HEAs possess an outstanding combination of strength and ductility and excellent surface properties including hardness, wear resistance, oxidation and corrosion resistance, which make them suitable candidates for hard-facing applications [11,12]. Currently, encouraging researches on the manufacture of HEAs coating on the traditional materials have been reported [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Laser Cladding of Al0.5CoCrCuFeNiSi High Entropy Alloy Coating without and with Yttria Addition on H13 Steel

et al. 2020

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Al0.5CoCrCuFeNiSi high entropy alloy coating without and with a 1 wt.% Y2O3 addition was fabricated by laser cladding technique on H13 substrate. The results showed that the laser cladding coatings without and with Y2O3 addition consist of a mixture of body centered cubic (BCC) dendrites and face centered cubic (FCC) interdendrites. With the addition of Y2O3, the peaks of BCC dendrites in the coating shifted to leftwards, which is caused by the distortion of lattice due to the dissolution of Y with larger atomic radius. There exist cracks and porosities in the coating without Y2O3 addition. With Y2O3 addition, the cracks and porosities in the laser cladding coating were inhibited greatly. In addition, the microstructure of the coating with Y2O3 addition was refined due to the improving of the ratio of nucleation. The enhancement of properties, such as hardness, wear resistance and corrosion resistance, of the coating with Y2O3 addition came from the inhibition of cracks and porosities and the refinement of microstructure.

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A Review on High Entropy Alloys Coatings: Fabrication Processes and Property Assessment

et al. 2019

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Surface coatings can enhance the mechanical and functional properties of substrates and keep good balance between specific mechanical properties and sufficient surface performance of the components. Coatings composed of high entropy alloys (HEAs) and HEA‐based materials, including metallic, ceramics, and composites have attracted the global attention and developed rapidly over the last decade, owing to their outstanding properties. Here, the authors provide a critical review of the state‐of‐the‐art for HEA‐based coatings, aiming to address the related conceptions, designing principles, microstructural, and mechanical evolutions during fabrication and post‐treatments process. The surface properties which are not limited to anti‐corrosion, anti‐radiation, and anti‐diffusion and their underlying mechanisms are analyzed. The development tendency and future applications are classified and discussed, including the basic researches about HEAs, the regulations of fabrication techniques and the exploring of functional properties of HEA‐based coatings. Due to their superior mechanical and functional potentials as well as abundant element‐constitutions of designing, surface coatings composed of HEA‐based materials are considered to have promising applications in engineering and industrial manufacturing.

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Evolution in microstructure and corrosion behavior of AlCoCrxFeNi high-entropy alloy coatings fabricated by laser cladding

Cited by 155 publications

References 42 publications

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

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

Laser Cladding of Al0.5CoCrCuFeNiSi High Entropy Alloy Coating without and with Yttria Addition on H13 Steel

A Review on High Entropy Alloys Coatings: Fabrication Processes and Property Assessment

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