Synergetic strengthening of additively manufactured (CoCrFeMnNi)99C1 high-entropy alloy by heterogeneous anisotropic microstructure

Park, Jeong Min; Choe, Jungho; Park, Hyung Keun; Son, Sujung; Jung, Jaimyun; Kim, Taek‐Soo; Yu, Juan; Kim, Jung Gi; Kim, Hyoung Seop

doi:10.1016/j.addma.2020.101333

Cited by 25 publications

(19 citation statements)

References 55 publications

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“…During MAM part fabrication, because of the complex thermal cycles, heterogeneous microstructures develop [29,30], and these heterogeneous microstructures are the reason for the improved strength and ductility in the MAM parts compared to the conventionally processed counterparts. Therefore, a thorough understanding of the evolution of these heterogeneous microstructures in the MAM parts would help develop materials with an excellent combination of high strength and ductility.…”

Section: Heterogeneous Microstructuresmentioning

confidence: 99%

“…The MPBs are generally considered the weakest regions in the MAM parts because of the presence of inhomogeneous microstructures and defects [34,44,55]. Although the defects can be reduced by careful process parameter optimization, de-cohesion of the MPBs at high strain levels is also reported [29,54]. Shifeng et al [34] reported that MPBs significantly affect the plastic deformation and fracture mode in 316L SS.…”

Section: Reproduced With Permission From Elseviermentioning

confidence: 99%

“…). To estimate the combined effect of these spatial heterogeneous grain structure with equiaxed and elongated columnar grains in SLM processed 1%C-CoCrFeMnNi, Park et al [29] employed a simple rule of mixtures approach. If the columnar and equiaxed grains are oriented parallel to the loading direction, the effective grain size (d eff.…”

Section: Grain Structurementioning

confidence: 99%

“…Most studies report the reasons for mechanical anisotropy in the MAM parts to, heterogeneous microstructures [32,43,157], epitaxial grain orientation [29,32,88,224], processing defects [34,44,225], and texture [29,34,88].…”

Section: Anisotropymentioning

confidence: 99%

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Heterogeneous Aspects of Additive Manufactured Metallic Parts: A Review

2021

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Metal additive manufacturing (MAM) is an emerging technology to produce complex end-use metallic parts. To adopt MAM for manufacturing numerous engineering parts used in critical applications, a thorough understanding of the relationship between the complex thermal cycles in MAM and the unique heterogeneous microstructures of MAM parts need to be established. This review article provides a comprehensive overview of the evolution of heterogeneous microstructures in MAM parts, including melt pool boundaries, heterogeneous grain structure, sub-grain cellular structure, matrix supersaturation, segregation, phase transformation, oxides formation, and texture. The evolution of residual stresses and the anisotropy in MAM parts and the post-MAM heat treatment effects on the microstructural evolution are also discussed. This review covers the microstructural aspects of most engineering materials in particular steels, high entropy alloys, aluminum alloys, titanium alloys, nickel-base superalloys, and copper alloys, with a primary focus on the parts manufactured using selective laser melting, direct energy deposition, and electron beam melting processes.

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Section: Heterogeneous Microstructuresmentioning

confidence: 99%

Section: Reproduced With Permission From Elseviermentioning

confidence: 99%

Section: Grain Structurementioning

confidence: 99%

Section: Anisotropymentioning

confidence: 99%

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Heterogeneous Aspects of Additive Manufactured Metallic Parts: A Review

2021

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“…Furthermore, the emergence of multi-principal element alloys, known as high-entropy alloys (HEAs) and medium-entropy alloys (MEAs), with no single dominant element in contrast to traditional dilute alloys, significantly increases the possibility of the discovery of new alloys via traditionally uncommon element grouping [8]. Based on this new alloying design concept, various alloys with high performance have been intensively developed over the past decade [2][3][4][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening

Park

Yang

Kim

et al. 2021

Materials Research Letters

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An equiatomic VCoNi medium-entropy alloy possesses high sensitivity to grain-boundary strengthening, achieved by severe lattice distortions. Its ultrafine-grain structure enables 1.5 Gigapascal yield strength even for the fully recrystallized alloy with a single face-centered cubic structure. The high density of grain boundaries also generates high back stresses via piling up of massive dislocations, and the low cross-slip probabilities produce not only robust dislocation-mediated plasticity but also high back stress contribution to flow stress, which affords high strain-hardening capability to ultrafine-grain alloys, with 1.7 Gigapascal ultimate tensile strength with remarkable ductility. Our approach provides a new method for developing ultrastrong metallic materials.

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Review: Multi-principal element alloys by additive manufacturing

Ferry

Kruzic

et al. 2022

J Mater Sci

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Multi-principal element alloys (MPEAs) have attracted rapidly growing attention from both research institutions and industry due to their unique microstructures and outstanding physical and chemical properties. However, the fabrication of MPEAs with desired microstructures and properties using conventional manufacturing techniques (e.g., casting) is still challenging. With the recent emergence of additive manufacturing (AM) techniques, the fabrication of MPEAs with locally tailorable microstructures and excellent mechanical properties has become possible. Therefore, it is of paramount importance to understand the key aspects of the AM processes that influence the microstructural features of AM fabricated MPEAs including porosity, anisotropy, and heterogeneity, as well as the corresponding impact on the properties. As such, this review will first present the state-of-the-art in existing AM techniques to process MPEAs. This is followed by a discussion of the microstructural features, mechanisms of microstructural evolution, and the mechanical properties of the AM fabricated MPEAs. Finally, the current challenges and future research directions are summarized with the aim to promote the further development and implementation of AM for processing MPEAs for future industrial applications.

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Synergetic strengthening of additively manufactured (CoCrFeMnNi)99C1 high-entropy alloy by heterogeneous anisotropic microstructure

Cited by 25 publications

References 55 publications

Heterogeneous Aspects of Additive Manufactured Metallic Parts: A Review

Heterogeneous Aspects of Additive Manufactured Metallic Parts: A Review

Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening

Review: Multi-principal element alloys by additive manufacturing

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