Phase Transformation Kinetics in Alloys
Summary
Phase transformation kinetics in alloys describes the rates and pathways by which one crystallographic phase converts into another under the influence of temperature, composition and stress. Central to this field are the competing mechanisms of nucleation and growth, the migration of interphase boundaries and the diffusion of solute atoms. Time–temperature–transformation (TTT) and continuous-cooling-transformation (CCT) diagrams provide practical maps of transformation rates in steels and other engineering alloys. Alloying elements, grain size, prior deformations and interfacial energy jointly determine the onset of transformation, the development of microstructural features such as ferrite, bainite, martensite or pearlite, and ultimately the mechanical properties. Advances in experimental techniques—from high-resolution microscopy to in situ imaging—and in multiscale modelling have enabled more precise control of transformation pathways, with direct implications for automotive steels, aerospace alloys and additive-manufactured components. Understanding the kinetics of phase transformations under complex thermal histories is vital for tailoring microstructures that meet ever-more demanding strength, toughness and formability requirements.
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Phase Transformation Kinetics in Alloys publication trend
The graph below shows the total number of articles in phase transformation kinetics in alloys across all publications each year (not limited to Nature Index journals).
Technical terms
Nucleation: The initial formation of a new phase at discrete sites, often on grain boundaries or defects, which must overcome a critical energy barrier.
Growth rate: The speed at which a newly nucleated phase advances into the parent phase, controlled by interface mobility and diffusion of solute atoms.
Solute drag: The retardation of interface migration caused by the interaction of migrating boundaries with segregated solute atoms.
Time–temperature–transformation (TTT) diagram: A graphical representation showing the onset and completion times of a phase transformation at different isothermal temperatures.
Cellular automaton: A computational grid-based method that simulates microstructural evolution by applying local transformation rules to each cell.
References
- A novel 3D mixed-mode multigrain model with efficient implementation of solute drag applied to austenite-ferrite phase transformations in Fe-C-Mn alloys. Acta Materialia (2021).
- Multi-Scale Modeling of Microstructure Evolution during Multi-Pass Hot-Rolling and Cooling Process. Materials (2021).
- New insights into the character of austenite-ferrite boundaries in an additively manufactured duplex stainless steel. Scripta Materialia (2024).
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