The role of grain boundaries in low-temperature plasticity of olivine
revealed by nanoindentation
Abstract
• Nanoindentation experiments on a high-angle grain boundary (60 •
misorientation) in a pure forsterite bicrystal reveal that the interface
acts as a source of dislocations. • Nanoindentation experiments on a
high-angle grain boundary (60 • misorientation) in a pure forsterite
bicrystal reveal that the interface acts as an obstacle to incoming
dislocations, leading to pileups of dislocations. • Nanoindentation
experiments on a subgrain boundary (13 • misorientation) in a pure
forsterite bicrystal do not detect the impact of the interface on
dislocations.
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