Formation and Relative Stabilities of Core-Shelled L12-Phase Nano-structures in Dilute Al–Sc–Er Alloys

Zhang, Chaomin; Jiang, Yong; Guo, Xiuhua; Song, Kexing

doi:10.1007/s40195-020-01096-y

Cited by 15 publications

(2 citation statements)

References 42 publications

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“…Al-Sc-based alloys exhibit high yield and creep strength at both ambient and elevated temperatures due to the presence of the elastically hard, coherent, and nanosized Al 3 Sc (L1 2 ) dispersoid with a low coarsening rate. [1] The rare earth (RE) elements, such as Er, [2][3][4] Tm, [5] Yb, [2,3] and Lu, [5] were added to Al-Sc-based alloys to replace the Sc in Al 3 Sc precipitates, improving the mechanical properties. The strength of the material depends mainly on the inherent mechanical properties of the particle because precipitate shearing often occurs.…”

Section: Introductionmentioning

confidence: 99%

“…[3,6] Although experimental studies on plasticity have been extensively carried out in Al-Sc-RE alloys, [7,8] theoretical investigations have been rarely conducted owing to the difficulty in dealing with the superdislocation dissociation and deformation mechanism of L1 2 particles. RE (RE ¼ Er, Tm, Yb, Lu) elements can substitute for the Sc atom in the center of the particle to form L1 2 -Al 3 RE structures, [4,5,9] but the plastic mechanism has never been revealed in these precipitates.…”

Section: Introductionmentioning

confidence: 99%

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Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L1₂‐Al₃RE Compounds: A Comprehensive First‐Principles Study

Huang

Tang

et al. 2022

Physica Status Solidi (b)

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The complicated superdislocation dissociation, dislocation core properties, and slip mechanism of L12 structural alloys have been controversial. Herein, the generalized stacking‐fault energy surfaces (γ‐surfaces) of the {001}, {110}, and {111} planes in L12‐Al3RE (RE = Er, Tm, Yb, Lu) compounds are first calculated according to ab initio density functional theory. Based on the γ‐surfaces, the superdislocation dissociation modes are preliminarily estimated using the unstable and stable stacking‐fault energies and their ratio. The result shows that the possible type of dissociations cannot be determined just from these ratios. Then, the 2D Peierls–Nabarro (PN) model is applied to simulate the ⟨110⟩{111} superdislocation dissociation configuration evolution in L12‐Al3RE, and the complete dislocation properties, including the dissociation width, the dislocation movement, and the Peierls energy and stress, are also investigated. The present study indicates that the combination of the γ‐surface and the 2D PN model can comprehensively elucidate the superdislocation properties and deformation mechanisms of L12 structural alloys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L1₂‐Al₃RE Compounds: A Comprehensive First‐Principles Study

Huang

Tang

et al. 2022

Physica Status Solidi (b)

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Effect of Solutionization and Deformation on Microstructural Evolution and Mechanical/Electrical Properties of Al–Mg–Si Alloy with Er + Sc Co‐Addition

Chen,

et al. 2024

Adv Eng Mater

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Effect of solutionization (two‐step vs one‐step solution treatment) and deformation (one‐step solutionization + deformation vs no deformation) on microstructural evolution and mechanical/electrical properties of an aged Al–Mg–Si alloy with microalloying Er + Sc co‐addition is studied, respectively, in comparison with its counterpart with a single Sc addition at the same total addition content. Experimental results showed that the Er + Sc co‐added Al–Mg–Si alloy displayed a combination of aging hardness and electrical conductivity superior to the single Sc‐added alloy, under either two‐step or one‐step solution treatment. This highlights an effective microalloying way to improve the Al–Mg–Si alloy by partially using cheap Er rather than full addition of expensive Sc. While the introduction of deformation yielded to a higher aging hardness but a lower electrical conductivity in the Er + Sc co‐added alloy apparently than in the single Sc‐added alloy. When comparing among the Er + Sc co‐added alloys, it is found that, although the one‐step solutionization leads to the highest aging hardness (≈102 HV in peak aging) and the deformation introduction results in the highest electrical conductivity (up to 57.3% IACS), the two‐step solutionization brought about the best combination of aging hardness (≈87 HV) and electrical conductivity (up to 56.7% IACS). Microstructural evolution under different treatments is analyzed to rationalize the variation in aging hardness and electrical conductivity especially in the Er + Sc co‐added Al–Mg–Si alloy.

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First-Principles Investigation of the Interfacial Stability, Precipitate Formation, and Mechanical Behavior of Al3Li/Al3Zr/Al Interfaces

Qiu

Yang

et al. 2022

Metall Mater Trans A

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Formation and Relative Stabilities of Core-Shelled L12-Phase Nano-structures in Dilute Al–Sc–Er Alloys

Cited by 15 publications

References 42 publications

Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L1₂‐Al₃RE Compounds: A Comprehensive First‐Principles Study

Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L1₂‐Al₃RE Compounds: A Comprehensive First‐Principles Study

Effect of Solutionization and Deformation on Microstructural Evolution and Mechanical/Electrical Properties of Al–Mg–Si Alloy with Er + Sc Co‐Addition

First-Principles Investigation of the Interfacial Stability, Precipitate Formation, and Mechanical Behavior of Al3Li/Al3Zr/Al Interfaces

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Formation and Relative Stabilities of Core-Shelled L12-Phase Nano-structures in Dilute Al–Sc–Er Alloys

Cited by 15 publications

References 42 publications

Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L12‐Al3RE Compounds: A Comprehensive First‐Principles Study

Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L12‐Al3RE Compounds: A Comprehensive First‐Principles Study

Effect of Solutionization and Deformation on Microstructural Evolution and Mechanical/Electrical Properties of Al–Mg–Si Alloy with Er + Sc Co‐Addition

First-Principles Investigation of the Interfacial Stability, Precipitate Formation, and Mechanical Behavior of Al3Li/Al3Zr/Al Interfaces

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Product

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Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L1₂‐Al₃RE Compounds: A Comprehensive First‐Principles Study

Deep Insights into Complicated Superdislocation Dissociation and Core Properties of Dislocation in L1₂‐Al₃RE Compounds: A Comprehensive First‐Principles Study