Fabrication of multi-gradient heterostructured CoCrFeMnNi high-entropy alloy using laser metal deposition

Gu, Gang Hee; Kim, Eun Seong; Kwon, Hyuk-Sung; Son, Sujung; Kim, Rae Eon; Oh, Taek Gwon; Kim, Hyoung Seop

doi:10.1016/j.msea.2022.142718

Cited by 29 publications

(1 citation statement)

References 53 publications

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“…The formation of a large number of geometrically necessary dislocations in the plastic deformation process of graded metals and alloys can induce continuous strain hardening, which adapts to the incompatibility of the deformation process of nano-alloys and improves plasticity. 1–4 The unique gradient structure gives gradient nanostructured metals and alloys superior mechanical properties, high strength, and crack growth resistance, making them suitable for applications in safety-critical and load-bearing structural components, such as aerospace, automotive parts, and microelectronics industries. 5–7 The strain gradient of gradient metals and alloys can be induced under the action of uniaxial stretching, which leads to the transformation of uniaxial stress into multi-axial stress.…”

Section: Introductionmentioning

confidence: 99%

Double strengthening induced by grain boundary segregation of solute elements in gradient nano Ni–Co alloys

Zhang,

Guo,

Ren

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Double strengthening induced by grain boundary segregation of solute elements in gradient nano Ni–Co alloys

Zhang,

Guo,

Ren

et al. 2023

Phys. Chem. Chem. Phys.

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Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Abbasi,

Zarei‐Hanzaki,

Charkhchian

et al. 2024

Adv Eng Mater

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The present study aims to investigate the effect of friction stir processing (FSP) on the microstructural evolutions and mechanical properties of a nonequiatomic interstitial high‐entropy alloy (HEA). To achieve this, an as‐cast FeMnCoCrN interstitial HEA undergoes FSP to modify the as‐cast microstructure and investigate the resulting effects on mechanical properties. The grain size, sub‐boundaries, martensite fraction, and accommodated strain exhibit a gradient from the base metal (BM) to the stir zone (SZ). As a result of FSP, the average grain size in the upper SZ is significantly decreased from ≈700 μm in BM to 1.5 μm, which is around 500 times finer than that of the BM. Furthermore, the martensitic transformation in a single metastable face‐centered‐cubic phase specifically occurs in the thermomechanical‐affected and heat‐affected zones. Continuous and geometric dynamic recrystallizations triggered by FSP lead to the development of a refined equiaxed microstructure. This gradient microstructure, in turn, plays a pivotal role in achieving significantly improved mechanical properties when compared to the as‐cast microstructure. Remarkably, the yield strength doubles, the ultimate tensile strength increases from 548 to 852 MPa, and ductility increases by 16%.

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Heterostructured Metallic Structural Materials: Research Methods, Properties, and Future Perspectives

Dong,

Gao,

Xiao

et al. 2024

Adv Funct Materials

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Heterostructured (HS) materials, characterized by heterogeneous zones with differences in mechanical or physical properties, represent a revolutionary advancement in material science. During deformation, hetero‐deformation‐induced (HDI) stress forms due to the synergistic interactions between soft and hard zones, leading to remarkable HDI strengthening and strain hardening. This mechanism significantly enhances their performance, surpassing that of traditional homogeneous materials. This review delves into the classification, preparation techniques, fundamental deformation mechanisms, and research methods of HS materials. It outlines the preparation methods of various HS materials, emphasizing their unique characteristics and applications. The review elaborates on the fundamental deformation mechanisms of HS materials, focusing on non‐uniform plastic deformation behavior and HDI strain hardening. Furthermore, it explores the application of heterogeneous design concepts in materials, analyzing their microstructure tuning mechanisms and mechanical properties. This review aims to serve as a critical reference for the future design and development of new HS metallic structural materials, paving the way for innovations that can transform multiple industries. By highlighting the long‐term impact, this review not only enhances the understanding of HS materials but also provides a roadmap for future research and industrial applications, positioning HS materials as key players in the advancement of material technology.

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Fabrication of multi-gradient heterostructured CoCrFeMnNi high-entropy alloy using laser metal deposition

Cited by 29 publications

References 53 publications

Double strengthening induced by grain boundary segregation of solute elements in gradient nano Ni–Co alloys

Double strengthening induced by grain boundary segregation of solute elements in gradient nano Ni–Co alloys

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Heterostructured Metallic Structural Materials: Research Methods, Properties, and Future Perspectives

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