Phase transition induced by synchroshear in Al-Zn-Mg-Cu alloy

Xiang, Kaiyun; Ding, Lipeng; Jia, Zhihong; Yang, Xiaofang; Qing, Liu; Zhang, Hao

doi:10.1016/j.scriptamat.2022.114577

Cited by 15 publications

(2 citation statements)

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“…This displacive transformation is likely a variation of the syncroshear mechanism. ,− We performed a solid-state nudged elastic band (G-SSNEB) calculation to simulate syncroshear between c14 and c15 structures. The reaction coordinate shown in Figure.…”

Section: Resultsmentioning

confidence: 99%

“…The occurrence of this type of polytype transformation, and its alignment with the observed OR, has been comprehensively discussed in similar Laves phase systems and precipitates in other materials. 16,23,30,55,56 Further annealing of the NPs at a temperature slightly cooler than the phase transition temperature should lead to a complete c14 to c15 transformation.…”

Section: ■ Introductionmentioning

confidence: 99%

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Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)₂ Nanoprecipitates in Zr-2.5Nb

Kamath,

Long,

Aiyeru

et al. 2023

J. Phys. Chem. C

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Zirconium alloys have widespread applications in nuclear energy, with Zr-2.5Nb commonly being used as pressure tube material in reactors. Their microstructure encompasses intermetallic nanoprecipitates (NPs) and solutes that significantly impact their behavior in corrosive environments and irradiation. Hence, we analyze the crystal structure of Zr((Zr,) Nb,Fe)2 NPs using transmission electron microscopy (TEM), electronic density functional theory (DFT) calculations, and finite element analysis (FEA). Our findings unveil a mixed c14 and c15 Laves phase structure within the NPs and provide an explanation through the syncroshear mechanism. Through thermodynamic analysis, we evaluate the electronic, vibrational, and strain contributions to the free energy of the NPs. Our results indicate that the c15 structure is energetically favored at temperatures below 600 K, while the c14 structure prevails at higher temperatures. We provide an explanation for the observed coexistence of these structures in the NPs based on two key insights: (1) During annealing at high temperatures, the energetically favorable c14 NPs form, and (2) as the alloy cools, a partial phase transition to the c15 structure occurs, constrained by kinetic limitations. Furthermore, our study reveals that the NP/α-Zr interface is likely to be incoherent due to the considerable stresses involved. This finding is consistent with high-resolution transmission electron microscopy (HRTEM) micrographs, which demonstrate the presence of an incoherent interface.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)₂ Nanoprecipitates in Zr-2.5Nb

Kamath,

Long,

Aiyeru

et al. 2023

J. Phys. Chem. C

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Effect of Scandium Addition on Mechanical Properties and Microstructural Evolution in Al-Zn-Mg Alloys Processed through the Friction Stir Processing

Mandal¹,

Anant

Kumar

2022

Metallogr. Microstruct. Anal.

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Revealing complex planar defects and their interactions at atomic resolution in a Laves phase containing Co-base superalloy

Wang,

Pyczak

et al. 2024

Acta Materialia

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Phase transition induced by synchroshear in Al-Zn-Mg-Cu alloy

Cited by 15 publications

References 14 publications

Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)₂ Nanoprecipitates in Zr-2.5Nb

Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)₂ Nanoprecipitates in Zr-2.5Nb

Effect of Scandium Addition on Mechanical Properties and Microstructural Evolution in Al-Zn-Mg Alloys Processed through the Friction Stir Processing

Revealing complex planar defects and their interactions at atomic resolution in a Laves phase containing Co-base superalloy

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Phase transition induced by synchroshear in Al-Zn-Mg-Cu alloy

Cited by 15 publications

References 14 publications

Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)2 Nanoprecipitates in Zr-2.5Nb

Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)2 Nanoprecipitates in Zr-2.5Nb

Effect of Scandium Addition on Mechanical Properties and Microstructural Evolution in Al-Zn-Mg Alloys Processed through the Friction Stir Processing

Revealing complex planar defects and their interactions at atomic resolution in a Laves phase containing Co-base superalloy

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Product

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Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)₂ Nanoprecipitates in Zr-2.5Nb

Solid-State Phase Transformation Explains the Mixed Crystallographic Character of Zr(Nb,Fe)₂ Nanoprecipitates in Zr-2.5Nb