High-throughput synthesis of Mo-Nb-Ta-W high-entropy alloys via additive manufacturing

Moorehead, Michael; Bertsch, K.M.; Niezgoda, Michael; Parkin, Calvin; Elbakhshwan, Mohamed; Sridharan, Kumar; Zhang, Chuan; Thoma, Dan J.; Couet, Adrien

doi:10.1016/j.matdes.2019.108358

Cited by 184 publications

(44 citation statements)

References 40 publications

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“…Laser powder feed methods allows to construct these kinds of materials where we can analyze from the same process run, many possibilities in different properties using the same set of alloying elements. And in [87] using four elements (Mo, Nb, Ta and W) and combining modeling with the linear combination of the four elements is demonstrated the suitability of the DMD method to develop different complex alloys.…”

Section: Refractory High Entropy Alloysmentioning

confidence: 99%

“…In [86] a HEA is built from elemental powders, where it was mixed elements with three levels of melting points (Mo, Nb and Ta over 2400 °C, Cr at 1907 °C and Al, at 660); despite some evaporation problems with the Al, the selective EBM processing method is suitable to develop such a complex alloy from elemental powders. In [87] is obtained a complete map of microstructures, obtained by building by DMD several compositions maintaining three fix elements (MoNbTa, MoNbW and NbTaW) and varying from null the fourth one (W, Nb and No, respectively). Laser powder feed methods allows to construct these kinds of materials where we can analyze from the same process run, many possibilities in different properties using the same set of alloying elements.…”

Section: Refractory High Entropy Alloysmentioning

confidence: 99%

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High Entropy Alloys Manufactured by Additive Manufacturing

Torralba

Campos

2020

Metals

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High entropy alloys have attracted much interest over the last 16 years due to their promising an unusual properties in different fields that offer many new possible application. Additionally, additive manufacturing has drawn attention due to its versatility and flexibility ahead of a new material challenge, being a suitable technology for the development of metallic materials. Moreover, high entropy alloys have demonstrated that many gaps exist in the literature on its physical metallurgy, and in this sense, additive manufacturing could be a feasible technology for solving many of these challenges. In this review paper the newest literature on this topic is condensed into three different aspects: the different additive manufacturing technologies employed to process high entropy alloys, the influence of the processing conditions and composition on the expected structure and microstructure and information about the mechanical and corrosion behavior of these alloys.

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Section: Refractory High Entropy Alloysmentioning

confidence: 99%

Section: Refractory High Entropy Alloysmentioning

confidence: 99%

High Entropy Alloys Manufactured by Additive Manufacturing

Torralba

Campos

2020

Metals

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“…Also, a re-melting step without powder flow is necessary for homogenization of the element distribution and to avoid unmolten particles. Further research on DED of refractory metal high entropy alloys is published by Moorhead et al [ 35 ] or Li et al [ 36 ], who also successfully demonstrated the formation of refractory metal high entropy alloys by DED.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Alloy Formation of a WMoTaNbV Refractory Metal High Entropy Alloy by Laser Powder Bed Fusion (PBF-LB/M)

2021

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High entropy or multi principal element alloys are a promising and relatively young concept for designing alloys. The idea of creating alloys without a single main alloying element opens up a wide space for possible new alloy compositions. High entropy alloys based on refractory metals such as W, Mo, Ta or Nb are of interest for future high temperature applications e.g., in the aerospace or chemical industry. However, producing refractory metal high entropy alloys by conventional metallurgical methods remains challenging. For this reason, the feasibility of laser-based additive manufacturing of the refractory metal high entropy alloy W20Mo20Ta20Nb20V20 by laser powder bed fusion (PBF-LB/M) is investigated in the present work. In-situ alloy formation from mixtures of easily available elemental powders is employed to avoid an expensive atomization of pre-alloyed powder. It is shown that PBF-LB/M of W20Mo20Ta20Nb20V20 is in general possible and that a complete fusion of the powder mixture without a significant number of undissolved particles is achievable by in-situ alloy formation during PBF-LB/M when selecting favorable process parameter combinations. The relative density of the samples with a dimension of 6 × 6 × 6 mm3 reaches, in dependence of the PBF-LB/M parameter set, 99.8%. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) measurements confirm the presence of a single bcc-phase. Scanning electron microscopy (SEM) images show a dendritic and/or cellular microstructure that can, to some extent, be controlled by the PBF-LB/M parameters.

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“…A new approach, presented in Ref. 19, involves synthesizing individual samples with laser metal deposition, each having a distinct composition. Such libraries of individual samples allow more flexibility regarding heat treatment, but may also allow deformation of samples for mechanical characterization.…”

Section: Introductionmentioning

confidence: 99%

Experimental Methods to Enable High-Throughput Characterization of New Structural Materials

Ellendt

Clausen

Mensching

et al. 2021

JOM

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Data-driven methods for developing new structural materials require large databases to identify new materials from known process routes, the resulting microstructures, and their properties. Due to the high number of parameters for such process chains, this can only be achieved with methods that allow high sample throughputs. This paper presents the experimental approach of the "Farbige Zustände" method through a case study. Our approach features a high-temperature drop-on-demand droplet generator to produce spherical micro-samples, which are then heat-treated and subjected to various short-time characterizations, which yield a large number of physical, mechanical, technological, and electrochemical descriptors. In this work, we evaluate achievable throughput rates of this method resulting in material property descriptions per time unit. More than 6000 individual samples could be generated from different steels, heat-treated and characterized within 1 week. More than 90,000 descriptors were determined to specify the material profiles of the different alloys during this time. These descriptors are used to determine the material properties at macro-scale.

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High-throughput synthesis of Mo-Nb-Ta-W high-entropy alloys via additive manufacturing

Cited by 184 publications

References 40 publications

High Entropy Alloys Manufactured by Additive Manufacturing

High Entropy Alloys Manufactured by Additive Manufacturing

In-Situ Alloy Formation of a WMoTaNbV Refractory Metal High Entropy Alloy by Laser Powder Bed Fusion (PBF-LB/M)

Experimental Methods to Enable High-Throughput Characterization of New Structural Materials

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