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Theses
Precipitation evolution in an Al-Zn-Mg alloy during non-isothermal heat treatments and in the heat-affected zone of welded joints.
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.
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.
Cited literature [62 references]
https://tel.archives-ouvertes.fr/tel-00370436
Contributor : Alexis Deschamps <>
Submitted on : Tuesday, March 24, 2009 - 1:52:35 PM
Last modification on : Thursday, November 19, 2020 - 3:54:17 PM
Long-term archiving on: : Thursday, June 10, 2010 - 6:24:06 PM
Contributor : Alexis Deschamps <>
Submitted on : Tuesday, March 24, 2009 - 1:52:35 PM
Last modification on : Thursday, November 19, 2020 - 3:54:17 PM
Long-term archiving on: : Thursday, June 10, 2010 - 6:24:06 PM