<i>In-situ</i> study of crystallization kinetics in ternary bulk metallic glass alloys with different glass forming abilities

Lan, Si; Wei, Xiaoya; Zhou, Jie; Liu, Xiongjun; Wu, Xuelian; Feygenson, Mikhail; Neuefeind, J.; Wang, Xun-Li

doi:10.1063/1.4901905

Cited by 34 publications

(9 citation statements)

References 18 publications

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“…Studying materials transition in-situ is one of the best approaches to unravel the mechanisms and dynamics of metastable phase selection. While interesting growth mechanisms have been revealed in nano particles [24][25][26][27][28][29], understanding of bulk materials' transformation processes may be affected by artifacts during TEM sample preparation as well as the thin film limit where bulk behavior is no longer manifest since samples need to be thinned to make them elec…”

Section: Introductionmentioning

confidence: 99%

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations

et al. 2019

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Phase selection and growth of materials far from equilibrium provides fertile ground for novel phases and morphologies since a multitude of different pathways may be energetically accessible. In this study, a complex metastable devitrification of Al60Sm11 (ε-phase) from its amorphous precursor is discovered using a combination of in-situ high-energy X-ray diffraction (HEXRD), providing insight into the average bulk behavior, and in-situ aberration corrected scanning transmission electron microscopy, revealing the atomic scale mechanisms of growth and their dynamics. We have found that non-equilibrium chemical partitioning disrupts the nominal planer growth by formation of nanoscale Al enriched regions inhomogeneously segregated at the ε/glass interface, to locally balance the compositionally dependent driving force and the associated diffusional burden imposed on its grain growth. These Al-rich regions form fcc-Al-rich nanocrystallites epitaxially with the ε-phase, modifying ε/glass interface mobility and creating a crenulated growth front. This new mechanism offers a pathway for fabricating alloy structures with nanoprecipitate dispersions through a meta-stable phase transition.

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Section: Introductionmentioning

confidence: 99%

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations

et al. 2019

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“…The intense neutron beam accessible using the NOMAD instrument at the spallation neutron source (SNS) [14] uniquely makes it possible to consider conducting time-resolved neutron diffraction experiments [15]. Having observed that nucleation probability approximately scales with sample volume, the larger sample size required for the neutron diffraction experiments provided access to nucleation at T iso values for which there was an extremely small nucleation probability for the smaller sample size of the TtXRD experiments.…”

Section: Temperature-and Time-resolved Neutron Diffraction (Ttnd)mentioning

confidence: 99%

From Rate Measurements to Mechanistic Data for Condensed Matter Reactions: A Case Study Using the Crystallization of [Zn(OH2)6][ZnCl4]

et al. 2016

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Abstract:The kinetics of crystallization of the R = 3 hydrate of zinc chloride, [Zn(OH 2 ) 6 ][ZnCl 4 ], is measured by time-resolved synchrotron x-ray diffraction, time-resolved neutron diffraction, and by differential scanning calorimetry. It is shown that analysis of the rate data using the classic Kolmogorov, Johnson, Mehl, Avrami (KJMA) kinetic model affords radically different rate constants for equivalent reaction conditions. Reintroducing the amount of sample measured by each method into the kinetic model, using our recently developed modified-KJMA model (M-KJMA), it is shown that each of these diverse rate measurement techniques can give the intrinsic, material specific rate constant, the velocity of the phase boundary, v pb . These data are then compared to the velocity of the crystallization front directly measured optically. The time-resolved diffraction methods uniquely monitor the loss of the liquid reactant and formation of the crystalline product demonstrating that the crystallization of this hydrate phase proceeds through no intermediate phases. The temperature dependent v pb data are then well fit to transition zone theory to extract activation parameters. These demonstrate that the rate-limiting component to this crystallization reaction is the ordering of the waters (or protons) of hydration into restricted positions of the crystalline lattice resulting in large negative entropy of activation.

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“…Previous studies have mainly exploited liquid-phase or cryogenic TEM, analyzing complex transient structural rearrangements occurring in aqueous solutions supersaturated in calcium carbonate, − calcium phosphate, calcium sulfate, colloidal silica, or sodium chloride . Fewer authors attempted instead to elucidate thermally activated crystal nucleation processes in melts and glasses using a heating stage: the existing literature mainly focuses on metallic glasses (for instance ref − ), with semiconductor glasses such as fluorides and oxides , still posing major challenges due to their lower tolerance to beam damage.…”

Section: Introductionmentioning

confidence: 99%

Crystallization Mechanism of Gel-Derived SiO₂–TiO₂ Amorphous Nanobeads Elucidated by High-Temperature In Situ Experiments

Zandonà

Véron

Helsch

et al. 2023

Crystal Growth & Design

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SiO2–TiO2 amorphous nanobeads with a TiO2 content up to 50 mol % were synthesized by sol–gel spray drying. Their crystallization during heat treatments was then characterized by in situ high-temperature techniques including X-ray diffraction, Raman spectroscopy, and particularly high-resolution transmission electron microscopy. Intrinsic nanoscale chemical modulations could be identified already in the as-prepared nanobeads and were shown to play a major role for the nonisochemical precipitation of TiO2 nanocrystals during heating experiments: the size and compositional contrast of such fluctuations progressively evolved and increased until the emergence of long-range ordering. The formation of TiO2 polymorphs occurred according to Ostwald’s rule of stages, with the metastable TiO2(B) phase acting as a precursor to stabilize anatase and rutile. The temporary appearance of TiO2(B) nanocrystals at early annealing stages was interpreted as the first direct experimental observation of subcritical crystalline nuclei.

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In-situ study of crystallization kinetics in ternary bulk metallic glass alloys with different glass forming abilities

Cited by 34 publications

References 18 publications

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations

From Rate Measurements to Mechanistic Data for Condensed Matter Reactions: A Case Study Using the Crystallization of [Zn(OH2)6][ZnCl4]

Crystallization Mechanism of Gel-Derived SiO₂–TiO₂ Amorphous Nanobeads Elucidated by High-Temperature In Situ Experiments

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In-situ study of crystallization kinetics in ternary bulk metallic glass alloys with different glass forming abilities

Cited by 34 publications

References 18 publications

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations

From Rate Measurements to Mechanistic Data for Condensed Matter Reactions: A Case Study Using the Crystallization of [Zn(OH2)6][ZnCl4]

Crystallization Mechanism of Gel-Derived SiO2–TiO2 Amorphous Nanobeads Elucidated by High-Temperature In Situ Experiments

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Crystallization Mechanism of Gel-Derived SiO₂–TiO₂ Amorphous Nanobeads Elucidated by High-Temperature In Situ Experiments