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Abstract

Aluminum alloys importance on the broad fields of engineering is unbroken and therefore the understanding of complex hardening processes like precipitation is fundamental for guaranteeing required mechanical properties and applications. As it is been demonstrated recently spinodal decomposition precipitation was assumed [1] and implemented into open source phase-field software, OpenPhase [2], using a recently developed dissipation model for interfaces [3,4]. Furthermore, mechanochemical coupling [5] is taken into account which features new aspects of precipitation processes [6]. For evaluation, different interface homogenization methods for elastic properties were implemented into our software [7]. First precipitate growth simulations (metastable δ’) were done for a binary Al-Li alloy and will be extended to Al-Cu and Al-Li-Cu. Moreover, the growth behaviour and interaction of adjacent precipitates are analyzed and will be compared to experimental results. Forward-looking, other processes like coherency loss effects during phase transformation, the consideration of Onsager atomic mobilities and the influence of vacancies on the kinetic and structure of precipitates will be analyzed.

References:
[1] K.T. Kashyap, P.G. Koppad, Bull. Mater. Sci., 34 (2011) 1455.
[2] www.openphase.de
[3] I. Steinbach, L. Zhang, M. Plapp, Acta Mater., 60 (2012) 2702.
[4] I. Steinbach, Ann. Rev. Mater. Res., 43 (2013) 89.
[5] F.C. Larche, J.W. Cahn, Acta Metall., 30 (1982) 1835.
[6] R. Darvishi Kamachali, E. Borukhovich, O. Shchyglo, I. Steinbach, Philos. Mag. Letters, 93 (2013)680.
[7] K. Ammar, B. Appolaire, G. Cailletaud, S. Forest, European Journal of Computational Mechanics, 18 (2009) 485.