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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Interface-driven Phenomena in Solids: Thermodynamics, Kinetics and Chemistry
Presentation Title The Role of Interfaces for Structural Transformations Among Austenite, Ferrite and Cementite in Fe-C Alloys
Author(s) Xie Zhang, , Jutta Rogal, Joerg Neugebauer
On-Site Speaker (Planned)
Abstract Scope During the cooling process of Fe-C alloys a decomposition of the high-temperature austenitic phase into ferrite and cementite takes place. The atomistic modelling of the involved processes at the interface is challenged by the simultaneous changes in Fe lattice structure and redistribution of C to accommodate the reduced C solubility. With a combination of the orientation relationships between austenite, ferrite and cementite, we identify an intermediate structure, which serves as a link between the three phases. It spatially extends over a few atomic layers and stabilizes the interfaces similar to complexions. Based on this framework, different mechanisms depending on the local conditions (C concentration, strain, magnetism) are revealed from ab initio nudged elastic band simulations, which allow us to construct a theory for the structural transformations among austenite, ferrite and cementite.
Proceedings Inclusion? Planned: A print-only volume


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Atomic-Level Mechanisms of Grain Boundary Segregation and Embrittlement in Nickel-Sulfur
Atomic Investigation of the Role of Alloying Elements on the Thermodynamics of Vacancies and Vacancy-Hydrogen Clusters at Symmetric Tilt Boundaries in Nickel
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Equilibrium Fluctuations of Grain Boundary Properties in Alloy Systems
Experimental Observations and Modeling of Interfacial Defects at an Asymmetric Σ=5 Grain Boundary in Fe
Exploring the Causes and Effects of Fast Grain Boundary Motion
Grain Boundary Adsorption Transition and Their Influence on Mass Transport and Microstructural Evolution
Grain Boundary Damage Resistance and Accommodation using Atomistic Simulations
Grain Growth and Segregation in Hf-Ti Nanometallic Multilayers
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HREM Studies on the Nature of Morphological Changes in (110) Grain Boundaries of Silicon Phase Found in Sr-induced Al-Si Eutectic Alloys
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Interface Mediated Formation of Monatomic Metallic Glasses
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Microstructure Design of Mechanically Alloyed Materials
Microstructure Evolution and Consolidation Kinetics Prediction in Powder Materials during Field Assisted Sintering Technique
Migration Mechanisms of Flat Σ3 Grain Boundaries
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Periodic Layers Structure in Mg/SiO2 System Created in the Solid State
Structural Modifications Due to Interface Chemistry at Metal-nitride Interfaces
Structure, Bonding and Adhesive Strength of Interfaces between fcc Fe and Mixed Transition Metal Carbides and Nitrides M1M2[C,N] and the Role of Misfit Dislocations
The Atomistic Mechanism of Interface Migration during a Diffusional Structural Phase Transition
The Development of Large Twin Related Domains in Grain Boundary Engineered Cu
The Effect of Interfaces and Hierarchical Structure on the Deformation Behavior of Metallic Nanolaminates
The Influence of Local Stress States on Hydrogen Segregation at Grain Boundaries in FCC Metals
The Influence of Temperature in the Formation of Highly Nanotwinned Cu Alloys: Varying the Twin Thickness
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The Temperature Dependence of Grain Boundary Energy in Yttria-doped Alumina: Effect of a Complexion Transition
Thermodynamic High-temperature Stability in Nano Metallic Multilayers
Twin Boundary Energy as a Driving Force for Microstructural Instability in Thin Films
Utilizing TEM-based Techniques to Map Strain Fields near Interfaces in Metals and Ceramics
Watching the Growth of Si Particles in a Liquid: The Role of Twin Defects on Microstructural Evolution
Wetting of Three Different Cu-Nb Interfaces by He Precipitates
Zener Pinning of Grain Boundary Migration in Immiscible Nano-crystalline Alloys

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