Abstract
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.
Highlights
Measurement of static recrystallization kinetics (SRX) [1] of metallic materials is of primary importance to optimize annealing treatments subsequent to any manufacturing processes inducing thermomechanical loadings
This paper proposes a new methodology to investigate recrystallization kinetics by using high temperature nanoindentation
We show in this paper that high temperature nanoindentation allows for fast and economical recrystallization kinetics characterization
Summary
Measurement of static recrystallization kinetics (SRX) [1] of metallic materials is of primary importance to optimize annealing treatments subsequent to any manufacturing processes inducing thermomechanical loadings. The first step – i.e. incubation step – is mainly viewed as the consequence of high dislocation densities within a set of grains, that later result in nuclei almost-free of dislocations by static recovery. The second step – i.e. grain boundary migration step – is governed by the difference in stored energy – i.e. local dislocation density gradients – between nuclei and old grains. Recrystallization is complete when no former grains remain in the microstructure. As a matter of fact, recrystallized materials are significantly softer than as-received materials and can exhibit somewhat different microstructures in terms of texture and anisotropy. The strong cube texture in recrystallized rolled aluminum sheets results in a plastic anisotropy which can be detrimental to deep drawing [1]
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