|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Abnormal Grain Growth in the Presence of a Static Particle Dispersion
||Elizabeth Holm, Todd Hoffmann, Anthony D. Rollett, Christopher G. Roberts
|On-Site Speaker (Planned)
Dispersions of second phase particles are often used to inhibit grain growth in polycrystalline metals, so it stands to reason that they might also prevent abnormal grain growth. We used mesoscale grain growth simulations to test this hypothesis for two cases: an initially unpinned polycrystal, and an initially pinned polycrystal. When we added inert, static second phase particles to an initially unpinned structure, abnormal grain growth occurred as if in the absence of particles; only when the abnormal grains impinged and began to grow normally did particle pinning occur. When we induced pinning by placing inert, static second phase particles along grain boundaries, abnormal grain growth occurred even in systems that did not grow abnormally in the absence of particles. We explain this particle-assisted abnormal grain growth in terms of boundary fluctuations and mobility advantage. These results have important implications for designing microstructures that are resistant to abnormal growth.
||Definite: A CD-only volume