Excellent strength-ductility synergy in metastable high entropy alloy by laser powder bed additive manufacturing

Agrawal, P.; Thapliyal, Saket; Nene, S.S.; Mishra, Rajiv S.; McWilliams, Brandon; Cho, K.C.

doi:10.1016/j.addma.2020.101098

Cited by 33 publications

(26 citation statements)

References 35 publications

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“…Agrawal et al effectively printed a new metastable Fe 40 Mn 20 Co 20 Cr 15 Si 5 without any cracks and a small void volume percentage (≈0.1%). [ 108 ] The HEA showed outstanding strength–ductility synergy under tensile loading because of the uniform distribution of the void and the work hardenability of the material. Niu et al evaluated the compressive strength of an equimolar SLM CoCrFeMnNi HEA.…”

Section: Properties Of High‐entropy Alloys (Heas) Fabricated Via Slmmentioning

confidence: 99%

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

Alomar

Concli

2020

Adv Eng Mater

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Section: Properties Of High‐entropy Alloys (Heas) Fabricated Via Slmmentioning

confidence: 99%

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

Alomar

Concli

2020

Adv Eng Mater

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“…However, the PBF-LB/M process is characterized by unique thermo-mechanical conditions, like high cooling rates in the range of 10 6 K/s [10] and a cyclic re-heating during melting of consecutive scan tracks and layers. Especially the high cooling rates open up possibilities for developing and processing novel alloy classes, like bulk metallic glasses [11] or compositionally complex alloys or high entropy alloys, respectively [12]. However, the range of possible alloy compositions is vast and the availability of pre-alloyed powder is limited.…”

Section: Introductionmentioning

confidence: 99%

Laser Powder Bed Fusion (PBF-LB/M) Process Strategies for In-Situ Alloy Formation with High-Melting Elements

Huber

Rasch

Schmidt

2021

Metals

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In-situ alloy formation by Laser Powder Bed Fusion (PBF-LB/M) from mixtures of easily available elemental powders is an appealing approach for developing and qualifying new alloys for laser based additive manufacturing of metals. However, especially when dealing with high-melting elements, like W, Ta, Mo, or Nb, it is difficult to achieve a homogeneous element distribution and a complete fusion of the powder particles. The aim of this work was to understand the effects of the PBF-LB/M process parameters (laser power, scan speed, laser spot diameter) and three different single- and double-exposure strategies on the fusion of high-melting W, Ta, Mo, and Nb particles in a Ti-matrix. For this purpose, 220 samples with 10 vol.% of the high-melting particle fraction were prepared and analyzed by optical light microscopy and automated image processing, as well as by scanning electron microscopy (SEM). The results are discussed in the context of current research on the process dynamics of PBF-LB/M. Based on that process strategies to support a complete fusion of high-melting particles during in-situ alloy formation are derived. It is shown that the number of unmolten particles can be at least decreased by a factor of ten compared to the most unfavorable parameter combination. For the lower melting elements, Nb and Mo, a complete fusion without any remaining particles visible in the microsections was achieved for certain parameter combinations. The results prove the feasibility of in-situ alloy formation with high-melting alloying elements, but they also demonstrate the necessity to adjust the PBF-LB/M process strategy to achieve a complete dissolution of the alloying elements.

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“…A number of papers have been published on the use of refractory high entropy alloys (see chapter 6). In this case, a BCC structure is always developed [42,[68][69][70] An interesting microstructural analysis of the MA HEAs is also made in the above mentioned study [22]. From this analysis the authors classify this family of alloys in four specific groups: CoCrFeNi, AlxCoCrFeNi, CoCrFeMnNi and Ti25Zr50Nb0Ta5.…”

Section: Microstructural Analysis Of the Additive Manufactured Alloysmentioning

confidence: 98%

“…But considering this review of additive manufacturing, many studies exist with relevant results on tensile features. Most of these investigations have obtained the data from parts processed by SLM [38,44,45,49,56,[70][71][72][73][74][75], although there are some others that explored the tensile behavior over EBM materials [40,52,75,76] or processed by DMD methods [28][29][30]33,35,37].…”

Section: Tensile Features Of Additive Manufactured Heasmentioning

confidence: 99%

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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Excellent strength-ductility synergy in metastable high entropy alloy by laser powder bed additive manufacturing

Cited by 33 publications

References 35 publications

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

Laser Powder Bed Fusion (PBF-LB/M) Process Strategies for In-Situ Alloy Formation with High-Melting Elements

High Entropy Alloys Manufactured by Additive Manufacturing

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