A Dilatometric Study of the Non Isothermal Aging of a Cold Rolled Al-Mg-Si Alloy

Abdelali Hayoune

doi:10.4028/www.scientific.net/DDF.367.103

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 367A Dilatometric Study of the Non Isothermal Aging...

A Dilatometric Study of the Non Isothermal Aging of a Cold Rolled Al-Mg-Si Alloy

Abstract:

In contrast to isothermal aging, few reports document the non-isothermal aging of deformed Al–Mg–Si alloys. The knowledge of non-isothermal aging of pre-deformed Al–Mg–Si alloys is of primary importance to understand the thermal stability as well as to control the microstructure of the final product during industrial processing. Therefore, the present work has been focused to understand the microstructure evolution during the continuous heating of a cold rolled Al–Mg–Si alloy. This has been followed using dilatometry, Differential Scanning Calorimetry, X-Ray Diffraction and microhardness measurement. Based on the results obtained, it is shown that dilatometry is a powerful tool to study phase transformations in deformed Al-Mg-Si alloys, moreover, the microstructural evolution, of the cold rolled sample, can be described as follows: at the earlier stages of the non-isothermal aging, formation and then the reversion of fully coherent GP zones take place. This is followed by the simultaneous occurrence of β” and β’ precipitation and recovery reaction. By continuing aging, the next reactions which will take place are β” and β’ dissolution and recrystallization. Finally, one can observe the formation and then the dissolution of the equilibrium phase β.