Investigation of the Coherent Strain Evolution of the η' phase in Al–Zn–Mg–Cu alloys via scanning transmission electron microscopy

Hou, Xianhua; Ma, Guoxi; Bai, Peng; Lang, Fengchao; Zhao, Xueping; Liu, Fei; Xing, Yongming

doi:10.1016/j.jallcom.2020.158111

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…By analyzing selected area diffraction patterns on the plate-shaped phases from zone Ⅰ, the results show that the weak diffraction spots located at the 1/3

Al and 2/3

Al indicate that these precipitates are η′ phases. The results are consistent with Ref [ 36 , 37 ]. Figure 4 b presents the element mapping of precipitates in zone Ⅱ, the long needle-like phase and the plate-shaped phase, which are rich in Zn, Mg, and Cu elements, but depleted in Al element.…”

Section: Resultssupporting

confidence: 94%

Hot Deformation Behavior and Microstructure Evolution of a Novel Al-Zn-Mg-Li-Cu Alloy

Zhu

Jiang

et al. 2022

Materials

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Lightweight structural alloys have broad application prospects in aerospace, energy, and transportation fields, and it is crucial to understand the hot deformation behavior of novel alloys for subsequent applications. The deformation behavior and microstructure evolution of a new Al-Zn-Mg-Li-Cu alloy was studied by hot compression experiments at temperatures ranging from 300 °C to 420 °C and strain rates ranging from 0.01 s−1 to 10 s−1. The as-cast Al-Zn-Mg-Li-Cu alloy is composed of an α-Al phase, an Al2Cu phase, a T phase, an η phase, and an η′ phase. The constitutive relationship between flow stress, temperature, and strain rate, represented by Zener–Hollomon parameters including Arrhenius terms, was established. Microstructure observations show that the grain size and the fraction of DRX increases with increasing deformation temperature. The grain size of DRX decreases with increasing strain rates, while the fraction of DRX first increases and then decreases. A certain amount of medium-angle grain boundaries (MAGBs) was present at both lower and higher deformation temperatures, suggesting the existence of continuous dynamic recrystallization (CDRX). The cumulative misorientation from intragranular to grain boundary proves that the CDRX mechanism of the alloy occurs through progressive subgrain rotation. This paper provides a basis for the deformation process of a new Al-Zn-Mg-Li-Cu alloy.

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“…By analyzing selected area diffraction patterns on the plate-shaped phases from zone Ⅰ, the results show that the weak diffraction spots located at the 1/3

Al and 2/3

Section: Resultssupporting

confidence: 94%

Hot Deformation Behavior and Microstructure Evolution of a Novel Al-Zn-Mg-Li-Cu Alloy

Zhu

Jiang

et al. 2022

Materials

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“…The techniques for the quantitative evaluation of the displacement of atoms and related elastic strain developed by Hÿtch [203,204] and Galindo [205] provided remarkable progress in understanding the strain distribution in the microstructure, especially on the atomic scale. Thus far, there have been many reports on the characterization of elastic strain not only at the grain boundaries as twins [206] and dislocations at the grain boundaries [207][208][209] but also at the interphase boundary in the device [210], heterointerface at an epitaxially grown superlattice [211], and precipitate/matrix interfaces [212][213][214][215][216]. In addition to the strain (stress) field evaluated by the precise measurement of the displacement of atoms, the differential phase-contrast (DPC) imaging by a segmented detector [217] spread a new era in the visualization of electric [218,219] and magnetic fields [220] on an atomic scale.…”

Section: Prospects Of the Quantitative Characterization Of Interface ...mentioning

confidence: 99%

Quantitative Characterization by Transmission Electron Microscopy and Its Application to Interfacial Phenomena in Crystalline Materials

2024

Materials

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This paper reviews quantitative characterization via transmission electron microscopy (TEM) and its application to interfacial phenomena based on the results obtained through the studies. Several signals generated by the interaction between the specimen and the electron beam with a probe size of less than 1 nm are utilized for a quantitative analysis, which yields considerable chemical and physical information. This review describes several phenomena near the interfaces, e.g., clear solid–vapor interface (surface) segregation of yttria in the zirconia nanoparticles by an energy-dispersive X-ray spectroscopy analysis, the evaluation of the local magnetic moment at the grain boundary in terms of electron energy loss spectroscopy equipped with TEM, and grain boundary character dependence of the magnetism. The direct measurement of the stress to the dislocation transferred across the grain boundary and the microstructure evolution focused on the grain boundary formation caused by plastic deformation are discussed as examples of material dynamics associated with the grain boundary. Finally, the outlook for future investigations of interface studies, including the recent progress, is also discussed.

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“…[1][2][3][4][5][6] The precipitation sequence during aging treatment in Al-Zn-Mg-Cu aluminum alloys is as follows: supersaturated solid solution → vacancy-rich solute atomic cluster → GP zone (GPI and GPII zones) → η′ metastable phase → η stable phase (MgZn 2 ). [7][8][9][10][11][12][13][14] Usually, this precipitation process runs continuously. It is generally considered that the GP zone, the η′ phase, and their dispersion are the main resources for the hardening of 7-series aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of retrogression re‐aging treatment on the stress corrosion behavior of the 7075 Al–Zn–Mg–Cu alloy

Liu

Guo

et al. 2022

Materials & Corrosion

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This paper studies the influence of the regression re-aging (RRA) process on the mechanical properties and corrosion resistance of 7075. In the RRA heat treatment, the material properties are markedly affected by the variation of parameters in the regression stage. When the regression temperature and the regression duration increase, the mechanical properties of the material decrease. There was no intergranular corrosion in the samples treated by RRA, while obvious intergranular corrosion occurred in the T6 sample. Compared with the T6 sample, the RRA-190-0.5 sample with optimized parameters has a higher density of the precipitated phase and narrower precipitate-free zone, and the precipitated phase along the grain boundary is discontinuous, isolated, and short. Compared with the single-stage peak aging treatment, the RRA treatment can considerably improve the corrosion resistance and stress corrosion resistance but slightly reduce the strength. The best heat treatment process condition is 120°C/24 h + 190°C/0.5 h + 120°C/24 h.

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Investigation of the Coherent Strain Evolution of the η' phase in Al–Zn–Mg–Cu alloys via scanning transmission electron microscopy

Cited by 10 publications

References 25 publications

Hot Deformation Behavior and Microstructure Evolution of a Novel Al-Zn-Mg-Li-Cu Alloy

Hot Deformation Behavior and Microstructure Evolution of a Novel Al-Zn-Mg-Li-Cu Alloy

Quantitative Characterization by Transmission Electron Microscopy and Its Application to Interfacial Phenomena in Crystalline Materials

Effect of retrogression re‐aging treatment on the stress corrosion behavior of the 7075 Al–Zn–Mg–Cu alloy

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