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Precipitation evolution in an Al-Zn-Mg alloy during non-isothermal heat treatments and in the heat-affected zone of welded joints.

Abstract : Welding of Al-Zn-Mg alloys is increasingly used in the transportation industry. The optimisation of the welding process requires a good understanding of the microstructures generated by the rapid temperature rise in the heat-affected zone.
This study deals with the evolution of the precipitation state after welding of the 7108.50 alloy in different initial tempers. A quantitative characterisation of the hardening precipitates in the heat-affected zone has been carried out by SAXS, TEM and DSC just after welding and after different post-welding heat treatments. To better understand the mechanisms involved in the precipitation evolution during this highly non-isothermal thermal cycle, controlled heat treatments, including reversion and continuous heating, have been studied.
Modelling based on the evolution of a particle distribution has been developed in order to predict the precipitation state after various heat treatments, including welding.
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Submitted on : Tuesday, March 24, 2009 - 1:52:35 PM
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  • HAL Id : tel-00370436, version 1

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Myriam Nicolas. Precipitation evolution in an Al-Zn-Mg alloy during non-isothermal heat treatments and in the heat-affected zone of welded joints.. Material chemistry. Institut National Polytechnique de Grenoble - INPG, 2002. English. ⟨tel-00370436⟩

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