Microstructural characterisation of high-entropy alloy AlCoCrFeNi fabricated by laser engineered net shaping

Kunce, Izabela; Polański, Marek; Karczewski, Krzysztof; Płociński, T.; Kurzydłowski, Krzysztof J.

doi:10.1016/j.jallcom.2015.05.144

Cited by 171 publications

(53 citation statements)

References 39 publications

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“…11 Apart from bulk material consolidation methods such as casting and sintering, HEAs can also be deposited as a surface coating. Various techniques of welding, 9,12 thermal spraying, 13 selective laser melting, 14 direct laser deposition 8,[15][16][17][18] and additive manufacturing [19][20][21][22] are already reported in the literature as experimental methods to produce HEA coatings.…”

Section: Introductionmentioning

confidence: 99%

“…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. It is expected that a decrease of grain size of AlCoCrFeNi deposits with increasing scanning speed will increase the microhardness.…”

Section: Introductionmentioning

confidence: 99%

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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%

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 enlarged view of a particle shows that the coarse particles are composed of larger ones with a few small caps, Figure 2b. This is owing to the turbulent flow in the atomisation chamber and the collisions of the solidifying droplets [32]. The elemental mapping images confirm that all the metal elements are distributed uniformly within the particle volume and there is no compositional segregation, Figure 2c.…”

Section: Microstructure and Chemical Compositionmentioning

confidence: 81%

“…But the degree of sphericity (characterizes the degree of proximity of the particle shape to the sphere) and symmetry, and fluidity of the asprepared powders need to be further improved. Now researchers have paid more attention to the synthesis of high-entropy alloy powders by gas atomization method [32][33][34][35]. However, detailed studies on the corrosion resistance and magnetic properties of the CoCrFeMnNi powders have not been reported.…”

Section: Introductionmentioning

confidence: 99%

CoCrFeMnNi high‐entropy alloy powder with excellent corrosion resistance and soft magnetic property prepared by gas atomization method

Jin¹,

Gu²,

Feng

et al. 2019

Materialwissenschaft Werkst

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To successfully fabricate high‐entropy alloys by powder metallurgy, laser cladding, or thermal sprayed method, the high‐entropy alloy powders possessing good homogeneous microstructure are very important. However, the study on the properties of the high‐entropy alloy powder has still been lacking. In this work, an equiatomic CoCrFeMnNi high‐entropy alloy powder with spherical shape was synthesized by gas atomization method. The as‐atomized CoCrFeMnNi high‐entropy alloy powder is composed of a single face‐centered cubic solid solution phase with the particle size of 34.0 μm. Furthermore, the as‐atomized powder exhibits excellent corrosion resistance in 10 % hydrochloric acid solution to 304 L stainless steel powder, and also shows an excellent soft magnetic behavior. Therefore, the gas atomization method can be used to generate other kinds of high‐entropy alloy powders for many challenging industrial applications.

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“…This is considered to be important because any dilution of the HEA composition with Mg would likely decrease the corrosion resistance of the HEA. Kunce et al [12] produced the AlCoCrFeNi high-entropy thin-walled samples using the laser engineered net shaping (LENS) technology. The effect of the cooling rate during solidification on the microstructure of the alloy was studied through different laser-scanning rates.…”

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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Microstructural characterisation of high-entropy alloy AlCoCrFeNi fabricated by laser engineered net shaping

Cited by 171 publications

References 39 publications

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Additive Manufacturing of High-Entropy Alloys by Laser Processing

CoCrFeMnNi high‐entropy alloy powder with excellent corrosion resistance and soft magnetic property prepared by gas atomization method

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

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