| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Their Nanostructures
|
| Presentation Title |
D-19: Numerical Analysis of the Influence of the Second-phase Particle Morphology on the Alloy Microstructure Evolution |
| Author(s) |
M Nabil Bhuiyan, Serge Nakhmanson, Lesley Frame |
| On-Site Speaker (Planned) |
M Nabil Bhuiyan |
| Abstract Scope |
Uniform microstructure and stability of polycrystalline alloys largely depend on the grain boundaries (GBs) motion during heat treatment. The presence of secondary-phase particles along the GBs is an effective mechanism for stabilization of the polycrystalline structure. Utilizing phase field modeling combined with finite element method based computations, we analyzed the influence of the secondary-phase particle shape, size and volume fraction on the alloy microstructure evolution. We found grain distributions and growth rates to be dependent on the particle shape, while particle size was important in controlling GB mobility, as larger particles tend to occupy triple and quadruple GB junctions, thereby serving as efficient grain growth inhibitors. Our results also reveal that it is more difficult for GBs to pass through spheroidal particles of high aspect ratio compared to cuboid or spherical ones, which is why elongated shapes are more effective in producing finer grain size distributions. |