Mechanical and corrosion properties of AlCoCrFeNi high-entropy alloy fabricated with selective electron beam melting

Kuwabara, Kosuke; Shiratori, Hiroshi; Fujieda, Tadashi; Yamanaka, Kazushi; Koizumi, Yuichiro; Chiba, Akihiko

doi:10.1016/j.addma.2018.06.006

Cited by 75 publications

(57 citation statements)

References 42 publications

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“…Brif et al [ 55 ] studied the FeCoCrNi HEA alloy by the powder-bed technology, suggesting that the alloy remained in its single-phase solid-solution state and displayed excellent strength and ductility. Similarly, the phase evolution and mechanical properties of AlCoCrFeNi [ 52 ] and CoCrFeMnNi [ 59 ] HEAs were reported. In the current study, we review the application of AM in HEAs in terms of their microstructures, mechanical properties, and deformation mechanisms and compare them with conventional cast-HEAs.…”

Section: Introductionmentioning

confidence: 89%

“…The detailed elemental distribution in each phase is shown in Figure 4 . An AlCoCrFeNi HEA with BCC, B2, and FCC phases along the grain boundaries was fabricated by Kuwabara et al [ 52 ] by applying the SEBM method. Similarly, the SEBM samples presented fine and columnar grains along the building direction with a texture of <100>.…”

Section: Microstructure Evolution During the Am Processmentioning

confidence: 99%

“…The process of powder feeding, pre-heating, and melting will be repeated until the bulk metallic parts is completed [ 51 ]. SEBM has attracted increasingly attention in the past decade due to its unique advantages of the high energy density of the high scan speed, incident electron beam, and reduced operation cost, which make it a suitable method to produce materials used the harsh environment, such as titanium alloys, aluminum alloys, cobalt chromium alloys, and nickel-based alloys [ 52 ].…”

Section: Introductionmentioning

confidence: 99%

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Additive Manufacturing of High-Entropy Alloys: A Review

Chen

Yang

Liaw

2018

Entropy

177

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Owing to the reduced defects, low cost, and high efficiency, the additive manufacturing (AM) technique has attracted increasingly attention and has been applied in high-entropy alloys (HEAs) in recent years. It was found that AM-processed HEAs possess an optimized microstructure and improved mechanical properties. However, no report has been proposed to review the application of the AM method in preparing bulk HEAs. Hence, it is necessary to introduce AM-processed HEAs in terms of applications, microstructures, mechanical properties, and challenges to provide readers with fundamental understanding. Specifically, we reviewed (1) the application of AM methods in the fabrication of HEAs and (2) the post-heat treatment effect on the microstructural evolution and mechanical properties. Compared with the casting counterparts, AM-HEAs were found to have a superior yield strength and ductility as a consequence of the fine microstructure formed during the rapid solidification in the fabrication process. The post-treatment, such as high isostatic pressing (HIP), can further enhance their properties by removing the existing fabrication defects and residual stress in the AM-HEAs. Furthermore, the mechanical properties can be tuned by either reducing the pre-heating temperature to hinder the phase partitioning or modifying the composition of the HEA to stabilize the solid-solution phase or ductile intermetallic phase in AM materials. Moreover, the processing parameters, fabrication orientation, and scanning method can be optimized to further improve the mechanical performance of the as-built-HEAs.

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Section: Introductionmentioning

confidence: 89%

Section: Microstructure Evolution During the Am Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Additive Manufacturing of High-Entropy Alloys: A Review

Chen

Yang

Liaw

2018

Entropy

177

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“…Though the growing interest in the development of new materials for PB-AM is continuously increasing, today's state of the art regarding the trials for in situ alloying in PB-AM aiming at HEAs remains very restricted. Only few reported researches on this matter can be mentioned [22][23][24][25][26][27][28][29]32,39,51,90,[108][109][110][111].…”

Section: High Entropy Alloysmentioning

confidence: 99%

“…PB-AM with the high power beams is used for different group of materials: from light metals like Aluminum [5,6] and Titanium alloys [7][8][9][10], to steels [5,[11][12][13], and even refractory Tungsten [14], Tantalum [15], Inconel [16][17][18][19][20][21], high entropy alloys (HEAs) [22][23][24][25][26][27][28][29] and bulk metallic glass (BMG) materials [30][31]. In special literature, the term "additive manufacturing", in relation to both metallic materials and polymers, is more common than 3D-printing commonly used in the news popular literature.…”

Section: Introductionmentioning

confidence: 99%

Powder-bed additive manufacturing for aerospace application: Techniques, metallic and metal/ceramic composite materials and trends

et al. 2019

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The current paper is devoted to classification of powder-bed additive manufacturing (PB-AM) techniques and description of specific features, advantages and limitation of different PB-AM techniques in aerospace applications. The common principle of “powder-bed” means that the used feedstock material is a powder, which forms “bed-like” platform of homogeneous layer that is fused according to cross-section of the manufactured object. After that, a new powder layer is distributed with the same thickness and the “printing” process continues. This approach is used in selective laser sintering/melting process, electron beam melting, and binder jetting printing. Additionally, relevant issues related to powder raw materials (metals, ceramics, multi-material composites, etc.) and their impact on the properties of as-manufactured components are discussed. Special attention is paid to discussion on additive manufacturing (AM) of aerospace critical parts made of Titanium alloys, Nickel-based superalloys, metal matrix composites (MMCs), ceramic matrix composites (CMCs) and high entropy alloys. Additional discussion is related to the quality control of the PB-AM materials, and to the prospects of new approaches in material development for PB-AM aiming at aerospace applications.

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Microstructural Transformation and Corrosion Property Improvement of CoCrFeNiTi‐Based Multi‐Principal Element Alloys Fabricated via Laser Powder Bed Fusion

et al. 2022

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Herein, CoCrFeNiTi‐based multiprincipal element alloys (MPEAs) are proposed to meet the demands of high mechanical strength and corrosion resistance in additively manufactured products. Two types of MPEAs with different chemical compositions are obtained by laser powder bed fusion (LPBF) using gas‐atomized prealloyed powders. Both MPEAs as‐built products have columnar crystal structures with face‐centered cubic (FCC) phase matrices. In the solution and aging heat treatment, columnar crystal grains transform into equiaxial recrystallized grains with precipitates dispersed in the FCC matrix. The alloys exhibit ultimate tensile strength over 1500 MPa and corrosion rates of less than 1 mm year−1 in boiling 10% H2SO4. The microcellular structures formed in the LPBF process, and the precipitates formed after heat treatments can affect the mechanical properties and corrosion behavior. The higher cobalt and chromium content of the proposed CoCrFeNiTi‐based MPEA and the microstructure control in heat treatments demonstrate their effectiveness in retarding acid corrosion.

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Mechanical and corrosion properties of AlCoCrFeNi high-entropy alloy fabricated with selective electron beam melting

Cited by 75 publications

References 42 publications

Additive Manufacturing of High-Entropy Alloys: A Review

Additive Manufacturing of High-Entropy Alloys: A Review

Powder-bed additive manufacturing for aerospace application: Techniques, metallic and metal/ceramic composite materials and trends

Microstructural Transformation and Corrosion Property Improvement of CoCrFeNiTi‐Based Multi‐Principal Element Alloys Fabricated via Laser Powder Bed Fusion

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