Advanced Particle-Containing FCC Metallic Materials: Process, Microstructure and Properties

Most industrial alloys contain a matrix phase and dispersed second-phase particles. Second-phase particles modify their microstructure during processing and subsequent heat treatment. The introduction of second-phase particles creates additional interfaces within the matrix, while fine particles could contribute significantly to dispersion strengthening, the existence of fracture by void formation at the interface between coarse particles and matrix is also well-documented. Therefore, they can either improve or deteriorate the associated mechanical properties of the fine particles could contribute significantly to dispersion strengthening, the existence of fracture by void formation at the interface between coarse particles and matrix is also well-documented. Therefore, they can either improve or deteriorate the associated mechanical properties of the investigated materials. The second-phase particles in industrial structural alloys are often unevenly distributed in the matrix, with non-uniform size and irregular shapes, making it highly difficult to analyse as current theories are mainly based on the simplified assumption that second-phase particles are uniformly dispersed in the matrix with a stable and spherical shape. A better understanding of these issues is of high academic and industrial interest, since it provides potential freedom for thermo-mechanical processing design and microstructure control.

The objective of this Research Topic is to explore recent progress on the double-edged effect of second-phase particles on the associated mechanical properties of metallic materials, i.e., the detrimental or beneficial effect on mechanical properties, such as:
1) The quantification of dispersion strengthening in structural alloys with unevenly distributed second-phase particles, e.g., under conditions with bimodal particle sizes or with particle depletion zones;
2) The influence of second-phase particles on microstructure evolution during manufacturing or deformation, e.g. recovery through dislocation annihilation or subgrain growth or the formation of particle deformation zones;
3) The evolution of unstable particles, including the nucleation, growth, coarsening, or dissolution of particles;
4) The effect of unstable and unevenly distributed particles on nucleation of recrystallization and grain boundary migration during processing or heat treatment;
5) The modelling of the above mentioned issues and their experimental validation.

The scope of this Research Topic includes but is not limited to:

· Characterization of second-phase particles in metallic materials
· Precipitation behavior of alloys (nucleation, growth, coarsening)
· Microstructure evolution in particle-containing metallic materials during processing
· Mechanical properties (Ductility, Strength, Fatigue etc.) associated with second-phase particles
· Aluminum alloys, Nickel-based superalloys, Oxide dispersion strengthened (ODS) steels etc.
· Modelling at different scales of related problems

Keywords: Second-Phase particles, Recrystallization, Microstructure, Mechanical Properties, Numerical Modelling

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https://www.frontiersin.org/research-topics/14712/