Influence of spinodal decomposition structures on the strength of Fe-Cr alloys: A dislocation dynamics study

Takahashi, Atsushi; Suzuki, Takaya; Nomoto, Akihiro; Kumagai, Tomohisa

doi:10.1016/j.actamat.2017.12.051

Cited by 22 publications

(5 citation statements)

References 27 publications

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“…This lattice mismatch generated an internal stress distribution within the material. The distributed internal stress can inhibit the dislocation motion and enhance the deformation behavior and material strength at the macroscale 44 . As described in the “Methods” section, the strengthening contribution of the spinodal decomposed structure was quantified as ~327 MPa.…”

Section: Resultsmentioning

confidence: 99%

Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Park,

Haftlang,

Heo

et al. 2024

Nat Commun

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Achieving an optimal balance between strength and ductility in advanced engineering materials has long been a challenge for researchers. In the field of material strengthening, most approaches that prevent or impede the motion of dislocations involve ductility reduction. In the present study, we propose a strengthening approach based on spinodal decomposition in which Cu and Al are introduced into a ferrous medium–entropy alloy. The matrix undergoes nanoscale periodic spinodal decomposition via a simple one-step aging procedure. Chemical fluctuations within periodic spinodal decomposed structures induce spinodal hardening, leading to a doubled strengthening effect that surpasses the conventional precipitation strengthening mechanism. Notably, the periodic spinodal decomposed structures effectively overcome strain localization issues, preserving elongation and doubling their mechanical strength. Spinodal decomposition offers high versatility because it can be implemented with minimal elemental addition, making it a promising candidate for enhancing the mechanical properties of various alloy systems.

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Section: Resultsmentioning

confidence: 99%

Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Park,

Haftlang,

Heo

et al. 2024

Nat Commun

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“…However, excessive spinodal decomposition significantly reduces ductility . Through dislocation dynamics (DD) simulations, Takahashi et al investigated the interaction between spinodal decomposition structures and dislocation motion, as well as their effect on CRSS . Furthermore, spinodal decomposition produces diffusive phase boundaries that have gradual component transformations over a finite distance, in contrast to sharp interfaces. , The structural nature of these diffusive interfaces enables them to facilitate the transmission of dislocations even under high flow stresses, without experiencing interfacial fracture, while maintaining a high dislocation storage capacity. , …”

Section: Bulk Nanostructured Heasmentioning

confidence: 99%

Nanostructured High Entropy Alloys as Structural and Functional Materials

Zhu,

Gao,

Yao

et al. 2024

ACS Nano

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Since their introduction in 2004, high entropy alloys (HEAs) have attracted significant attention due to their exceptional mechanical and functional properties. Advances in our understanding of atomic-scale ordering and phase formation in HEAs have facilitated the development of fabrication techniques for synthesizing nanostructured HEAs. These materials hold immense potential for applications in various fields including automobile industries, aerospace engineering, microelectronics, and clean energy, where they serve as either structural or functional materials. In this comprehensive Review, we conduct an in-depth analysis of the mechanical and functional properties of nanostructured HEAs, with a particular emphasis on the roles of different nanostructures in modulating these properties. To begin, we explore the intrinsic and extrinsic factors that influence the formation and stability of nanostructures in HEAs. Subsequently, we delve into an examination of the mechanical and electrocatalytic properties exhibited by bulk or three-dimensional (3D) nanostructured HEAs, as well as nanosized HEAs in the form of zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanowires, or two-dimensional (2D) nanosheets. Finally, we present an outlook on the current research landscape, highlighting the challenges and opportunities associated with nanostructure design and the understanding of structure−property relationships in nanostructured HEAs.

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“…The unmixing of Fe-Cr solid solution is a concern in many industrial applications (nuclear power plants, aeronautics…) where stainless steels -ferritic, martensitic and duplex -are employed at medium temperatures -typically in-between 300°C and 500°C, depending on the alloy composition -limiting the exposition time in this temperature range and/or restraining the use of these alloys below 300°C [1][2][3][4][5]. This very slow decomposition of the BCC phase, due to the presence of a miscibility gap in the Fe-Cr binary system, is causing continuous embrittlement of the alloy which is also known as the 475°C (885°F) embrittlement of ferritic stainless steels [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of Fe-Cr unmixing using differential scanning calorimetry and small-angle scattering

Couturier

Geuser²,

Deschamps³

2021

Materials Characterization

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Highlights Stainless steel Fe-Cr unmixing can be characterized using modulated DSC during solutionizing heat treatment of aged material  Transformation's enthalpy and temperature show significant evolution even for very early decomposition stages  Transformation's enthalpy and temperature are respectively correlated to composition fluctuations' amplitude and correlation length measured using smallangle scatteringColor should not be used for any figures in print.

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Influence of spinodal decomposition structures on the strength of Fe-Cr alloys: A dislocation dynamics study

Cited by 22 publications

References 27 publications

Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Nanostructured High Entropy Alloys as Structural and Functional Materials

A comparative study of Fe-Cr unmixing using differential scanning calorimetry and small-angle scattering

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