Karoly HIDAS, InSiDe-Strain



Research leading to these results was funded by the European Union Framework Programme 7 (EU-FP7/2007-2013) Marie Curie postdoctoral fellowship PIEF-GA-2012-327226 (InSiDe-Strain, 2013-2015)

Annealing experiments on metal alloys

In collaboration with


Laurent WALTZ	Marc MILESI

Why to perform in situ deformation/annealing experiments on alloys?

Analogue material: viscoplastic anisotropy of more complex minerals (e.g., olivine, quartz) and basic deformation phenomena (e.g., nucleation, recrystallization, recovery, grain boundary migration)
- geology
- material sciences

Deformation experiments at the LMGC, Montpellier (France)

Fig. 1 - Constant strain rate traction deformation experiment on polycrystalline zinc plate.

Annealing experiments at the Géosciences Montpellier (France)

Annealing experiments in an external oven/oil bath Microstructural analysis in the Crystal Probe SEM-EBSD facility (Fig. 2)

	Fig. 2 - CamScan X500-FEG CrystalProbe low-vacuum SEM-EBSD equipped with AZtec data acquisition software of Oxford Instruments for analysis.

Challenges and drawbacks

In-situ annealing is not possible due to sublimation (and, most importantly, precipitation) of zinc alloy in the sample chamber under vacuum, that permanently damages the microscope.

Results


	Fig. 3 - Textural change of the zinc alloy during annealing experiments. Color coding in the EBSD maps (left) corresponds to grain orientation that is shown in pole figures (top) in details. Maps are identical scale, but not the same area is shown. Note the overall grain growth that results in less variable orientation as annealing progresses.

Preliminary implications

In the course of post-dynamic annealing experiments:

statistically representative grain growth and grain boundary migration occur;
large scale observations are coherent with those during the annealing of ice I_h at a finer scale.