IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
GRAIN BOUNDARY ENERGY IN ICE: A ICE POLAR GRAIN GROWTH APLICATION
Autor/es:
CARLOS LEONARDO DI PRINZIO; DRUETTA, ESTEBAN; DI PRINZIO, CARLOS LEONARDO
Lugar:
Buenos Aires
Reunión:
Congreso; SCAR XXXI & Open Science Conference; 2010
Institución organizadora:
Scientific Committee on Antarctic Research
Resumen:
The size and shape of grains present in firn ice cores, is completely controlled by grain
growth. Grain growth is affected by second phase particles like bubbles, volcanic traces
and dust, and by the grain boundary energy and mobility anisotropy. At the present the
quantitative effects of each one of these variables are not completely understood .Monte
Carlo (MC) methods is proving to be a powerful tool particularly to study grain
boundary migration and the effect of the anistropic grain boundary energy. However,
experimental data of the ice grain boundary energy is very scarce. In this work, we
measured the grain boundary energy in ice bicrystalline samples with different
cristalline orientation and grain boundary inclination. We observed that the special
grain boundary misorientations have low grain boundary energy. A MC algorithm in
three dimensions (3D) polycrystalline samples is implemented to study the effect of the
grain energy anisotropy on the grain growth. Initial condition similar to those observed
in firn ice cores was used and the relative influence of the grain boundary energy drag
on the firm ice grain growth is studied.