About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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Presentation Title |
Grain-boundary Energy Variation and Evolution during Dislocation-assisted Grain-boundary Sliding in Polycrystaline Mg2SiO4 – Linking Earth and Materials Sciences |
Author(s) |
Katharina Tinka Marquardt, Alexandra Austin, Marina Sedlak, Filippe Ferreira, Lars N Hansen, Sanae Koizumi |
On-Site Speaker (Planned) |
Katharina Tinka Marquardt |
Abstract Scope |
Forsterite, the Mg-endmember of the olivine solid solution, is a refractory material of interest for high-temperature engineering applications and well studied in relation to its abundance in Earth’s upper mantle. The microstructure and physical properties of polycrystalline forsterite are controlled by the anisotropy of grain-boundary energy and its evolution in conjunction with dynamic processes such as deformation and recrystallization.
Here we compile results from recent investigations of (i) variation in grain-boundary energy anisotropy variation studied using AFM and grooving, (ii) grain-boundary population from EBSD measurements, and (iii) the evolution of these distributions during deformation in the dislocation-assisted grain-boundary sliding regime. The change in plane populations, as well as grain size, are key factors influencing the interconnectivity of melt, the extractability of melt from the upper mantle, and the attenuation of seismic waves. |