Dans ce livre, l'�volution microstructurale d'un alliage d'aluminium renforc� par le vieillissement a �t� simul�e en utilisant des mod�les de champ de phase micro et continu � l'�chelle atomique et m�soscopique respectivement. Tout d'abord, la s�gr�gation des atomes de solut� � la limite du grain, la nucl�ation des amas et la transformation structurelle des pr�curseurs de phase pr�cipit�s ordonn�s/d�sordonn�s dans l'alliage Al-Cu ont �t� simul�s � l'aide d'un champ de phase microscopique. Ensuite, un mod�le de champ multiphasique a �t� d�velopp� pour d�crire l'�volution des pr�cipit�s de vieillissement dans l'alliage Al-Mg-Si. La croissance des pr�cipit�s β'' pr�sentant le plus fort avantage de renforcement par vieillissement dans l'alliage Al-Mg-Si a �t� quantitativement simul�e en couplant la base de donn�es CALPHAD (calcul du diagramme de phase). Les effets des diff�rentes fractions de volume, morphologies et tailles des particules pr�cipit�es sur la croissance des grains ont �t� �tudi�s � l'aide d'un mod�le de champ de phase continu. Enfin, le m�canisme de d�formation plastique des mat�riaux polycristallins � diff�rentes �chelles sous l'effet d'une force externe a �t� �tudi�.

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