Regeneration Of Initial Properties After Fatigue
Damage In Aluminium Alloys
Author(s)
A. May, M. A. Belouchrani & A. Britah
Abstract
In the present work, the effects of heat treatments on the evolution of oligocyclic
fatigue damage on two types of aluminium alloys were studied. The two alloys
are largely used in the aircraft industry because of their good mechanical
characteristics and their lightness. The main factor influencing damage of these
two types of alloys is decohesion of interfaces in Al-Si, Al-Cu and Al-Mg
particles resulting from the stress concentration in these interfaces. Our work is
to repair this decohesion by the use of specific heat treatments. The monitoring
of the damage evolution is done by using the variation of electrical resistivity
resulting from the microstructure transformations; this change of the
microstructure is due to the variation of different parameters of annealing heat
treatment. This method allowed us to find the best parameters of the heat
treatments to use during repair. Those parameters are: temperature, maintaining
time and speed of cooling. The idea of using heat treatments is based on the role
of those heat treatments on the microstructure of material, on its behaviour
before and after the first stage of fatigue damage. From this viewpoint, we had to
make the microcavities created during the fatigue damage decrease; it will be
only a contribution to the regeneration of the initial properties before this
damage. The results obtained showed that the regeneration of the initial
properties of the material after fatigue damage is possible with appropriate heat
treatments and optimal treatment exists if a certain threshold of damage is not
reached. Finally, this process can be envisaged to increase the fatigue life of
components when these are submitted to fatigue loading.
Keywords: fatigue damage, heat treatment, aluminium alloys, electrical
resistivity and microstructure.
Keywords
fatigue damage, heat treatment, aluminium alloys, electrical
resistivity and microstructure
Related Book
Other papers in this volume
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