Direct Metal Deposition of Refractory High Entropy Alloy MoNbTaW

Dobbelstein, Henrik; Thiele, Magnus; Gurevich, Evgeny L.; George, E.P.; Ostendorf, Andreas

doi:10.1016/j.phpro.2016.08.065

Cited by 128 publications

(46 citation statements)

References 8 publications

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“…The microstructures were also compared to the same HEAs produced using conventional arc melting ( Figure 11). [93] This study showed that it is feasible to fabricate HEAs via in situ alloying during DLD process using pre-mixed powders. For the FCC/BCC microstructure, the structures differed significantly.…”

Section: Microstructure and Phase Formationmentioning

confidence: 83%

“…[85] In addition, due to the cyclic thermal histories in the additive manufacturing process, the pre-fabricated HEA layers are subject to an annealing process by the dissipated heat from current layers. [93] This will further deteriorate the properties of the fabricated HEAs. [6,89,90] From these two perspectives, how to control the global heat flux and local heat flux during additive manufacturing of HEAs is very critical for the phase formation in the fabricated HEAs.…”

Section: Additive Manufacturing and Requirements For Producing Bulk Mmentioning

confidence: 99%

“…No apparent difference has been detected in both the FCC and BCC microstructures produced using DLD and arc melting. [93] To achieve the successful fabrication of refractory HEAs with elements of different melting points, an additional remelting step between the powder deposition steps was needed. The underlying reason was attributed to a difference in the solidification rate and the thermal gradient in the melt pool between the DLD and arc melting, where DLD had much higher cooling rate and much larger thermal gradient than arc melting.…”

Section: Microstructure and Phase Formationmentioning

confidence: 99%

“…For the FCC/BCC microstructure, the structures differed significantly. [93] Figure 11. [119] Similarly, the influence of Al/Ni ratio on the microstructure and phase formation in the DLDed Al x FeCoCrNi 2-x HEA by Sistla et al [120] It was found that the Al/Ni ratio had a profound effect on the microstructure and phase formation of the fabricated HEA ( Figure 12).…”

Section: Microstructure and Phase Formationmentioning

confidence: 99%

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Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

2017

Adv Eng Mater

100

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Bulk metallic glasses (BMGs) and high entropy alloys (HEAs) are both important multi-component alloys with novel microstructures and unique properties, which make them promising for applications in many industries. However, certain hindrances have been identified in the fabrication of BMGs and HEAs by conventional techniques due to the intrinsic requirements of BMGs and HEAs. With the advent of metal additive manufacturing, new opportunities have been perceived to fabricate geometrically complex BMGs and HEAs with tailorable microstructure theoretically at any site within the specimen, which are not achievable using conventional fabrication techniques. After providing some background and introducing the conventional fabrication techniques for BMGs and HEAs, this review will focus on the current status, development, and challenges in metal additive manufacturing of BMGs and HEAs including different additive manufacturing techniques being used, microstructure design and evolution, as well as properties of the fabricated BMGs and HEAs. A future outlook of metal additive manufacturing of BMGs and HEAs will also be provided at the end.

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Section: Microstructure and Phase Formationmentioning

confidence: 83%

Section: Additive Manufacturing and Requirements For Producing Bulk Mmentioning

confidence: 99%

Section: Microstructure and Phase Formationmentioning

confidence: 99%

Section: Microstructure and Phase Formationmentioning

confidence: 99%

See 2 more Smart Citations

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

2017

Adv Eng Mater

100

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“…Great efforts have been made in studying the laser processing of HEAs in recent years [10][11][12][13][14]. Ocelík et al [10] explored the additive manufacturing of high-entropy clad layers by laser processing.…”

Section: Introductionmentioning

confidence: 99%

Effect of SLM Processing Parameters on Microstructures and Mechanical Properties of Al0.5CoCrFeNi High Entropy Alloys

Sun

Peng

Yang

et al. 2020

Metals

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Selective laser melting (SLM) to fabricate Al0.5CoCrFeNi high entropy alloys with pre-mixed powders was studied in this paper. The influences of process parameters including laser power, scanning speed, and hatch spacing on the relative density of high-entropy alloys (HEAs) were investigated. A relative density of 99.92% can be achieved by optimizing the SLM process parameters with laser power 320 W, scanning speed 800 mm/s, and hatch spacing of 60 μm, respectively. Moreover, the microstructure of the HEAs was also studied using scanning electron microscopy (SEM) and x-ray diffraction (XRD). It was found that the microstructure of the HEAs was only composed of face-centered cubic and body-centered cubic phases, without complex intermetallic compounds. The mechanical properties of the HEAs were also characterized. At ambient temperature, the alloys had a high yield strength of about 609 MPa, tensile strength about 878 MPa, and hardness about 270 HV. Through a comparison with the corresponding alloys fabricated by vacuum induction melting, it can be concluded that the high entropy alloys fabricated by SLM had fine microstructures and improved mechanical properties.

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Deformation Behavior of 3D‐Printed High‐Entropy Alloys: A Critical Review

Bajaj,

Feng,

et al. 2023

Adv Eng Mater

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The 3D‐printing of high‐entropy alloys (HEAs) is capable of enhancing the design and manufacturing flexibilities for the novel materials. Owing to the rapid solidification, the 3D‐printed HEAs exhibit markedly different microstructures than their conventionally‐manufactured equivalents, leading to peculiar mechanical properties. Many additively‐manufactured HEAs also break down the strength‐ductility trade‐off dilemma. Novel dynamics regarding the simultaneous and sequential nature of deformation mechanisms are emerging through recent intensive research on these materials. Herein the deformation behavior of 3D‐printed HEAs is reviewed and explained on the basis of the latest advances in this area. A comprehensive picture regarding the role of cellular dislocation networks, twinning‐induced plasticity (TWIP), and transformation‐induced plasticity (TRIP) in the monotonic and cyclic deformation of 3D‐printed HEAs is presented. Special emphasis is placed on fatigue characteristics due to the enormous interest in this burgeoning area. The effect of post‐fabrication thermomechanical processing on plasticity is discussed along with the microstructural evolution in the 3D‐printed HEAs. Several innovative developments that carry latent potential for further research are also deliberated in this review. Finally, the present understanding of the deformation behavior of 3D‐printed HEAs is summarized while gauging the future directions.This article is protected by copyright. All rights reserved.

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Direct Metal Deposition of Refractory High Entropy Alloy MoNbTaW

Cited by 128 publications

References 8 publications

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

Effect of SLM Processing Parameters on Microstructures and Mechanical Properties of Al0.5CoCrFeNi High Entropy Alloys

Deformation Behavior of 3D‐Printed High‐Entropy Alloys: A Critical Review

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