Localized phase transformation at stacking faults and mechanism-based alloy design

Feng, Longsheng; Kannan, Shakthipriya Baskar; Egan, Ashton; Smith, Timothy M.; Mills, Michael J.; Ghazisaeidi, Maryam

doi:10.1016/j.actamat.2022.118287

Cited by 15 publications

(2 citation statements)

References 47 publications

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“…Based on the Burgers vector analysis, the partial dislocations are derived from two unstable stacking faults along [

\overline{1}

\overline{1}

] α and [

0\overline{1}1

] α directions of the Al matrix. This is apparently different from the previous modes that rely on stable stacking faults to achieve phase transformations, for example, an fcc → hcp transformation in Al‐Ag, [33,34] Co‐Ni, [35,36] and Cu‐Si [37,38] alloys.…”

Section: Discussioncontrasting

confidence: 67%

Unexpected nucleation mechanism of T₁ precipitates by Eshelby inclusion with unstable stacking faults

Wang,

Xue

et al. 2024

Materials Genome Engineering Advances

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Aluminum‐lithium (Al‐Li) alloy is one of the most promising lightweight structural materials in the aeronautic and aerospace industries. The key to achieving their excellent mechanical properties lies in tailoring T1 strengthening precipitates; however, the nucleation of such nanoparticles remains unknown. Combining atomic resolution HAADF‐STEM with first‐principles calculations based on the density functional theory (DFT), here, we report a counterintuitive nucleation mechanism of the T1 that evolves from an Eshelby inclusion with unstable stacking faults. This precursor is accelerated by Ag‐Mg clusters to reduce the barrier, forming the structural framework. In addition, these Ag‐Mg clusters trap the free Cu and Li to prepare the chemical compositions for T1. Our findings provide a new perspective on the phase transformations of complex precipitates through solute clusters in terms of geometric structure and chemical bonding functions.

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“…Based on the Burgers vector analysis, the partial dislocations are derived from two unstable stacking faults along [

\overline{1}

\overline{1}

] α and [

0\overline{1}1

Section: Discussioncontrasting

confidence: 67%

Unexpected nucleation mechanism of T₁ precipitates by Eshelby inclusion with unstable stacking faults

Wang,

Xue

et al. 2024

Materials Genome Engineering Advances

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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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Preferential γ′ Precipitation on Coherent Annealing Twin Boundaries in Alloy 718

Mukhopadhyay

Xue

Sriram

et al. 2023

The Minerals, Metals &Amp; Materials Series

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Localized phase transformation at stacking faults and mechanism-based alloy design

Cited by 15 publications

References 47 publications

Unexpected nucleation mechanism of T₁ precipitates by Eshelby inclusion with unstable stacking faults

Unexpected nucleation mechanism of T₁ precipitates by Eshelby inclusion with unstable stacking faults

Nanostructured High Entropy Alloys as Structural and Functional Materials

Preferential γ′ Precipitation on Coherent Annealing Twin Boundaries in Alloy 718

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Localized phase transformation at stacking faults and mechanism-based alloy design

Cited by 15 publications

References 47 publications

Unexpected nucleation mechanism of T1 precipitates by Eshelby inclusion with unstable stacking faults

Unexpected nucleation mechanism of T1 precipitates by Eshelby inclusion with unstable stacking faults

Nanostructured High Entropy Alloys as Structural and Functional Materials

Preferential γ′ Precipitation on Coherent Annealing Twin Boundaries in Alloy 718

Contact Info

Product

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About

Unexpected nucleation mechanism of T₁ precipitates by Eshelby inclusion with unstable stacking faults

Unexpected nucleation mechanism of T₁ precipitates by Eshelby inclusion with unstable stacking faults