Περίληψη:
Small Angle Neutron Scattering (SANS) is a unique tool in the study of
the precipitation phenomena. The size, shape, number density, volume
fraction and chemical composition of the precipitates can be
unambiguously determined and the kinetic process can be investigated by
using samples that have undergone different heat treatments or by ‘’in
situ” experiments. Systems exhibiting slow kinetics and low precipitate
phase concentration (SiO2 precipitates in Si), fast kinetics for which
low temperature experiments are required to ‘’freeze” the precipitate
structure (Al-Zn) and ‘’in situ” experiments (Al-Li) will be discussed.
The experimental results are interpreted by kinetic models which
describe the precipitation process in these diverse growth conditions.
