The Preston of the Guinier-Preston Zones. Guinier

Duparc, O.B.M. Hardouin

doi:10.1007/s11661-010-0320-5

Cited by 16 publications

(3 citation statements)

References 66 publications

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“…Our studies of the atomic-and nanostructure of the dorsal arm plates of the brittlestar Ophiocoma wendtii (fig. S1) disclose the presence of coherent nanoprecipitates that induce comprehensive compressive stresses on the host single crystal, akin to the Guinier-Preston zones known in classical metallurgy (14). The arm plates of these brittlestars (15) are covered by hundreds of calcite lenses, each several tens of micrometers in size (16,17).…”

mentioning

confidence: 98%

Coherently aligned nanoparticles within a biogenic single crystal: A biological prestressing strategy

Polishchuk

Bracha

Bloch

et al. 2017

Science

110

158

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In contrast to synthetic materials, materials produced by organisms are formed in ambient conditions and with a limited selection of elements. Nevertheless, living organisms reveal elegant strategies for achieving specific functions, ranging from skeletal support to mastication, from sensors and defensive tools to optical function. Using state-of-the-art characterization techniques, we present a biostrategy for strengthening and toughening the otherwise brittle calcite optical lenses found in the brittlestar This intriguing process uses coherent nanoprecipitates to induce compressive stresses on the host matrix, functionally resembling the Guinier-Preston zones known in classical metallurgy. We believe that these calcitic nanoparticles, being rich in magnesium, segregate during or just after transformation from amorphous to crystalline phase, similarly to segregation behavior from a supersaturated quenched alloy.

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mentioning

confidence: 98%

Coherently aligned nanoparticles within a biogenic single crystal: A biological prestressing strategy

Polishchuk

Bracha

Bloch

et al. 2017

Science

110

158

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“…The results further demonstrate that the Mg65Cu15Ag10Gd10 alloys remain the amorphous feature after TC treatment. Down to the nanoscale, an interference peak occurs in the TC-treated sample whereas it does not exist in the as-cast sample according to the results of SAXS (Figure 1c), which suggests the occurrence of nanoscale heterogeneity different from the amorphous matrix in the TC-treated sample [28,[38][39][40]. Furthermore, a spheroid model with polydispersity is employed to fit the SAXS profile of the TC-treated sample, and the obtained size distribution function result is displayed in Figure 1c inset [41,42].…”

Section: Microstructure and Thermal Analysismentioning

confidence: 92%

Engineering Atomic-to-Nano Scale Structural Homogeneity towards High Corrosion Resistance of Amorphous Magnesium-Based Alloys

Qin

Zhang

et al. 2022

Micromachines

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Magnesium-based amorphous alloys have aroused broad interest in being applied in marine use due to their merits of lightweight and high strength. Yet, the poor corrosion resistance to chloride-containing seawater has hindered their practical applications. Herein, we propose a new strategy to improve the chloride corrosion resistance of amorphous Mg65Cu15Ag10Gd10 alloys by engineering atomic-to-nano scale structural homogeneity, which is implemented by heating the material to the critical temperature of the liquid–liquid transition. By using various electrochemical, microscopic, and spectroscopic characterization methods, we reveal that the liquid–liquid transition can rearrange the local structural units in the amorphous structure, slightly decreasing the alloy structure’s homogeneity, accelerate the formation of protective passivation film, and, therefore, increase the corrosion resistance. Our study has demonstrated the strong coupling between an amorphous structure and corrosion behavior, which is available for optimizing corrosion-resistant alloys.

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“…For Al-Cu based alloy, the precipitation sequence is based on the formation of the first coherent phase called a GP (Guinier Preston) zone which is then followed by intermediate coherent (𝜃 ′′ ) and semicoherent (𝜃 ′ ) phases before the stable θ(Al2Cu) phase. The precipitation reaction during the aging process for an Al-Cu alloy, such as 2017A is quite complex or/and not well defined in the literature, but can be generally described as follows [7][8][9][10]:…”

Section: Introductionmentioning

confidence: 99%

Effect of artificial aging treatment on microstructure, mechanical properties and fracture behavior of 2017A alloy

2022

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The effect of artificial aging treatment on 2017A aluminum alloy microstructure, mechanical properties, and fracture behavior was investigated. The samples were taken from the as-received alloy and aged at 170 °C for 5, 10, 15, 20, and 30 hours. An optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness and tensile strength tests were used to characterize mechanical and microstructural properties. The microstructural analysis revealed that as the aging treatment duration is increased, the size and density of precipitates grow larger and more numerous. According to X-ray diffraction measurements, the microstructural evolution caused by aging treatments is primarily due to an increase in precipitation of the hardening phase -Al2Cu. According to the tensile test results, the yield stress increases with increasing aging duration. The fracture surface analysis of failed specimens subjected to tensile loading revealed that the aging treatment conditions had a significant impact on the morphology and mode of fracture: the mixed-mode (ductile-brittle) failure was established for intermediate aging durations (aging at 170 °C for 15 and 20 h), and the intergranular fracture was found to be more pronounced when the aging duration is prolonged due to the coalescence of fine precipitates at the grain boundary.

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The Preston of the Guinier-Preston Zones. Guinier

Cited by 16 publications

References 66 publications

Coherently aligned nanoparticles within a biogenic single crystal: A biological prestressing strategy

Coherently aligned nanoparticles within a biogenic single crystal: A biological prestressing strategy

Engineering Atomic-to-Nano Scale Structural Homogeneity towards High Corrosion Resistance of Amorphous Magnesium-Based Alloys

Effect of artificial aging treatment on microstructure, mechanical properties and fracture behavior of 2017A alloy

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