Interface dominated cooperative nanoprecipitation in interstitial alloys

Wang, Hongcai; Zhang, Xie; Yan, Dingshun; Somsen, Christoph; Eggeler, Gunther

doi:10.1038/s41467-018-06474-w

Cited by 14 publications

(7 citation statements)

References 34 publications

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“…During the structural transformation from matrix to precipitates, the kinetics and the morphology of the precipitates may be dominated by the energetics of the involved interfaces between the precipitates and the confining matrix. This has been demonstrated in a recent study 328 of Fe 3 C precipitation in the well-established Fe-C system [Fig. 28(a)].…”

Section: Morphology Of Nanoprecipitatessupporting

confidence: 66%

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Defect-characterized phase transition kinetics

Zhang

Wang

et al. 2022

Applied Physics Reviews

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Phase transitions are a common phenomenon in condensed matter and act as a critical degree of freedom that can be employed to tailor the mechanical or electronic properties of materials. Understanding the fundamental mechanisms of the thermodynamics and kinetics of phase transitions is, thus, at the core of modern materials design. Conventionally, studies of phase transitions have, to a large extent, focused on pristine bulk phases. However, realistic materials exist in a complex form; their microstructures consist of different point and extended defects. The presence of defects impacts the thermodynamics and kinetics of phase transitions, but has been commonly ignored or treated separately. In recent years, with the significant advances in theoretical and experimental techniques, there has been an increasing research interest in modeling and characterizing how defects impact or even dictate phase transitions. The present review systematically discusses the recent progress in understanding the kinetics of defect-characterized phase transitions, derives the key mechanisms underlying these phase transitions, and envisions the remaining challenges and fruitful research directions. We hope that these discussions and insights will help to inspire future research and development in the field.

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Section: Morphology Of Nanoprecipitatessupporting

confidence: 66%

“…% C. By evaluating the MEP of C migration to interface I using NEB calculations (see Sec. III A 2), Wang et al 328 identified a thermodynamic driving force for C to diffuse from the ferrite matrix to the advancing interface [Fig. 28(c)].…”

Section: Morphology Of Nanoprecipitatesmentioning

confidence: 99%

Defect-characterized phase transition kinetics

Zhang

Wang

et al. 2022

Applied Physics Reviews

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“…However, this is beyond the scope of the current work. Details regarding this aspect of the microstructural evolution can be found elsewhere [28,[39][40][41]. e A HRTEM micrograph of a h particle in the WQ specimen.…”

Section: Microstructural Features Observed By Semmentioning

confidence: 99%

Effect of cooling rate on the microstructure and mechanical properties of a low-carbon low-alloyed steel

Wang

Cao

et al. 2021

J Mater Sci

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Heavy plate steels with bainitic microstructures are widely used in industry due to their good combination of strength and toughness. However, obtaining optimal mechanical properties is often challenging due to the complex bainitic microstructures and multiple phase constitutions caused by different cooling rates through the plate thickness. Here, both conventional and advanced microstructural characterization techniques which bridge the meso- and atomic-scales were applied to investigate how microstructure/mechanical property-relationships of a low-carbon low-alloyed steel are affected by phase transformations during continuous cooling. Mechanical tests show that the yield strength increases monotonically when cooling rates increase up to 90 K/s. The present study shows that this is associated with a decrease in the volume fraction of polygonal ferrite (PF) and a refinement of the substructure of degenerated upper bainite (DUB). The fine DUB substructures feature C-rich retained austenite/martensite-austenite (RA/M-A) constitutes which decorate the elongated micrograin boundaries in ferrite. A further increase in strength is observed when needle-shaped cementite precipitates form during water quenching within elongated micrograins. Pure martensite islands on the elongated micrograin boundaries lead to a decreased ductility. The implications for thick section plate processing are discussed based on the findings of the present work.

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“…In recent years, outside of the field of battery materials research, it has been reported that over-stoichiometric cations may locate at interstitial sites in various types of fcc lattices, [37][38][39][40][41][42] hinting at the possibility of over-stoichiometric chemical spaces for rock salt structures. Moreover, a number of pioneering works have indicated that interstitial sites (e.g., tetrahedral sites) in the fcc-or near-fcc-type cathodes may be occupied by cations, which also suggests that rock salt structures may host extra cations.…”

Section: Introductionmentioning

confidence: 99%

Over‐Stoichiometric Metastabilization of Cation‐Disordered Rock Salts

Wang,

Outka,

Takele

et al. 2023

Advanced Materials

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Cation‐disordered rock salts (DRXs) are well known for their potential to realize the goal of achieving scalable Ni‐ and Co‐free high‐energy‐density Li‐ion batteries. Unlike in most cathode materials, the disordered cation distribution may lead to more factors that control the electrochemistry of DRXs. An important variable that is not emphasized by research community is regarding whether a DRX exists in a more thermodynamically stable form or a more metastable form. Moreover, within the scope of metastable DRXs, over‐stoichiometric DRXs, which allow relaxation of the site balance constraint of a rock salt structure, are particularly underexplored. In this work, these findings are reported in locating a generally applicable approach to “metastabilize” thermodynamically stable Mn‐based DRXs to metastable ones by introducing Li over‐stoichiometry. The over‐stoichiometric metastabilization greatly stimulates more redox activities, enables better reversibility of Li deintercalation/intercalation, and changes the energy storage mechanism. The metastabilized DRXs can be transformed back to the thermodynamically stable form, which also reverts the electrochemical properties, further contrasting the two categories of DRXs. This work enriches the structural and compositional space of DRX families and adds new pathways for rationally tuning the properties of DRX cathodes.

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Interface dominated cooperative nanoprecipitation in interstitial alloys

Cited by 14 publications

References 34 publications

Defect-characterized phase transition kinetics

Defect-characterized phase transition kinetics

Effect of cooling rate on the microstructure and mechanical properties of a low-carbon low-alloyed steel

Over‐Stoichiometric Metastabilization of Cation‐Disordered Rock Salts

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