The use of high-entropy alloys in additive manufacturing

Brif, Yevgeni; Thomas, Meurig; Todd, Iain

doi:10.1016/j.scriptamat.2014.11.037

Cited by 414 publications

(168 citation statements)

References 19 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%

“…16 Another advantage of direct laser deposition is that coatings could be deposited in a few steps, which eliminates the influence of the substrate and allows gradual chemical compositional changes through the coating thickness. 23 Special additive manufacturing techniques like selective laser melting 14 allow also for building three-dimensional (3D) dimensional objects directly from FeCoCrNi HEA pre-alloyed powder, exhibiting high strength and ductility that are comparable with engineering materials like stainless steels. Direct deposition techniques like laser or TIG cladding are suitable to deposit HEA from a mixture of elemental powders.…”

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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“…Consequently, it would appear that additive manufacturing (AM), which facilitates a high level of local process control, generates rapid solidification cooling rates, and enables the production of complex geometries, may be a suitable way of utilizing HEAs as engineering materials. The application of selective laser melting (SLM)-the most extensively researched AM technique-to HEAs was recently reported [12,13]. Selective electron beam melting (SEBM) is another AM technique that possesses a number of potential advantages over SLM.…”

Section: Introductionmentioning

confidence: 99%

First demonstration of promising selective electron beam melting method for utilizing high-entropy alloys as engineering materials

et al. 2015

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“…It appears that our prediction is aligned with recent experimental results showing a uniform distribution of Cr in the CoCrFeNi alloy. 42 As shown in Fig. 3, the observed deviation of occupancy possibility from 25% in a short range will disappear at about 5 Å away in the CoCrFeNi alloy.…”

Section: Modeling High Entropy Alloy Cocrfenimentioning

confidence: 76%

Examination of Solid-Solution Phase Formation Rules for High Entropy Alloys from Atomistic Monte Carlo Simulations

Liu

Lei

Gray

et al. 2015

JOM

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In this study, we used atomistic simulation methods to examine solid-solution phase formation rules for CoCrFeNi high entropy alloy. Using the Monte Carlo simulations based on the modified embedded atom method (MEAM) potentials, we sampled the thermodynamically equilibrium structures of the CoCrFeNi alloy and further predicted that the CoCrFeNi alloy could form a solid solution phase with high configurational entropy of 1.329R at 1373 K. Furthermore, we examined the stability of this solid solution phase of the CoCrFeNi alloy against the well-recognized solid-solution phase formation rules by varying the MEAM potentials and thus tuning the atom size and mixing enthalpy in the alloy. Our simulation results revealed that it required atom size difference effect d j j < 0:05 and mixing enthalpy effect À10 kJ/mol < DH % 0 kJ/mol for the modeled CoCrFeNi alloy to remain a single solid solution phase.

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The use of high-entropy alloys in additive manufacturing

Cited by 414 publications

References 19 publications

Additive Manufacturing of High-Entropy Alloys by Laser Processing

Additive Manufacturing of High-Entropy Alloys by Laser Processing

First demonstration of promising selective electron beam melting method for utilizing high-entropy alloys as engineering materials

Examination of Solid-Solution Phase Formation Rules for High Entropy Alloys from Atomistic Monte Carlo Simulations

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