Solidification behaviour in laser cladding of AlCoCrCuFeNi high-entropy alloy on magnesium substrates

Yue, Tai Man; Xie, Hui; Lin, Xin; Yang, Haiou; Guo, Meng

doi:10.1016/j.jallcom.2013.10.254

Cited by 172 publications

(68 citation statements)

References 23 publications

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“…16,17,24 Typically, a slow laser beam scanning speed (<10 mm/s) is used to allow a proper mixture of elemental phases inside the melt pool formed under the laser beam. 17,[25][26][27] However, these scanning speeds still result in much higher solidification rates than during classic arc melting and casting. In the case when pre-alloyed HEA powders are used, 22 a wider range of scanning speeds could be used to study the influence of solidification rates on the microstructure and properties of laser-deposited HEAs.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

137

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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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Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Ocelík

Janssen

Smith

et al. 2016

JOM

137

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“…The combination of the hard (Ti,V) 5 Si 3 phase and relatively ductile and tough BCC matrix improved the sliding wear resistance. Yue et al [11] studied the solidification behavior in laser cladding of AlCoCrCuFeNi high-entropy alloy on magnesium substrates using the Kurz-Giovanola-Trivedi and the Gaümann models. Except for some Cu rejected into the Mg melt, no serious dilution of the HEA composition occurred in the top layer of the coating.…”

Section: Introductionmentioning

confidence: 99%

Slurry Erosion Behavior of AlxCoCrFeNiTi0.5 High-Entropy Alloy Coatings Fabricated by Laser Cladding

Zhao

et al. 2018

Metals

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High-entropy alloys (HEAs) have gained extensive attention due to their excellent properties and the related scientific value in the last decade. In this work, Al x CoCrFeNiTi 0.5 HEA coatings (x: molar ratio, x = 1.0, 1.5, 2.0, and 2.5) were fabricated on Q345 steel substrate by laser-cladding process to develop a practical protection technology for fluid machines. The effect of Al content on their phase evolution, microstructure, and slurry erosion performance of the HEA coatings was studied. The Al x CoCrFeNiTi 0.5 HEA coatings are composed of simple face-centered cubic (FCC), body-centered cubic (BCC) and their mixture phase. Slurry erosion tests were conducted on the HEA coatings with a constant velocity of 10.08 m/s and 16-40 meshs and particles at impingement angles of 15, 30, 45, 60 and 90 degrees. The effect of three parameters, namely impingement angle, sand concentration and erosion time, on the slurry erosion behavior of Al x CoCrFeNiTi 0.5 HEA coatings was investigated. Experimental results show AlCoCrFeNiTi 0.5 HEA coating follows a ductile erosion mode and a mixed mode (neither ductile nor brittle) for Al 1.5 CoCrFeNiTi 0.5 HEA coating, while Al 2.0 CoCrFeNiTi 0.5 and Al 2.5 CoCrFeNiTi 0.5 HEA coatings mainly exhibit brittle erosion mode. AlCoCrFeNiTi 0.5 HEA coating has good erosion resistance at all investigated impingement angles due to its high hardness, good plasticity, and low stacking fault energy (SFE).

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“…For instance, the AlCoCrCuFeNi HEA has been adopted for improving the surface properties of Mg and AZ91D substrates by means of a laser cladding technique [3][4][5][6][7]. Nevertheless, despite the improvement of the properties of the formed AlCoCrCuFeNi HEA coatings, the results also show that the interaction between the used HEA and the substrate may occur during processing.…”

Section: Introductionmentioning

confidence: 99%

Growth Morphology of CuMg2 in Laser Forming of AlCoCrCuFeNi Coating on Mg

Guo¹,

Liu²,

Qiu³

et al. 2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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Abstract-The AlCoCrCuFeNi high-entropy alloy coating was fabricated on pure magnesium by means of laser cladding using a direct blown powder method. The formed coating is composed of two different layers, i.e., a lower composite layer consisting of some partially melted HEA particles in a mixture of Mg and a top HEA coating. Also, some Cu was rejected into the substrate melt during the processing, resulting in the formation of CuMg 2 dendrites. Moreover, the dendritic structure of the CuMg 2 phase, which shows a faceted interface at low growth rates, is shown to undergo a transition from a faceted to non-faceted interface at relatively higher growth velocities. The change in solidification behavior of the formed CuMg 2 phase is likely to be due to the undercooling increase resulting from the solidification velocity increasing.

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Solidification behaviour in laser cladding of AlCoCrCuFeNi high-entropy alloy on magnesium substrates

Cited by 172 publications

References 23 publications

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Slurry Erosion Behavior of AlxCoCrFeNiTi0.5 High-Entropy Alloy Coatings Fabricated by Laser Cladding

Growth Morphology of CuMg2 in Laser Forming of AlCoCrCuFeNi Coating on Mg

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