Static recrystallization kinetics, at 300 • C, of a hot rolled commercial purity aluminum alloy AA1050 has been investigated using high temperature nanoindentation. Annealing treatments were achieved inside a nanoindentation device to measure corresponding hot nanohardness versus time. Clear evidences of recrystallization phenomenon were deduced from both hardness decrease and pop-in events on load-displacement curves. The recrystallized fraction for increasing annealing time was compared to conventional post mortem characterizations -i.e. EBSD and Vickers hardness -. A good agreement was found between in situ and post mortem characterization methods. High temperature nanoindentation is proved to be a powerful tool for fast characterization of materials' recrystallization kinetics.
A novel extrinsic method for the measurement of particle surface distribution
in a carbon black-filled elastomer via nanoindentation is developed.
This method is based on the measurement of the contact stiffness obtained
from the continuous stiffness measurement mode. The proposed tip–particle
model is held by two main hypotheses: the particles do not deform
significantly during indentation so that only the elastomer matrix
elastically deforms; particles are physically bounded with the surrounding
matrix. Therefore, when the tip comes in contact with a particle,
the latter becomes a hard extension of the tip, able to deform the
elastomer matrix. Finally, the evolution of the measured contact stiffness
is directly related to the increase of the contact area between the
tip–particles set and the elastomer matrix. The proposed model
is validated through a numerical and an experimental study. Moreover,
an evaluation of the measurements bias allows to correct the particle
surface distribution. A good agreement is found between the distribution
measured from transmission electron microscopy observations and nanoindentation
measurements.
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