A generalized segregation model for concurrent dendritic, peritectic and eutectic solidification - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2009

A generalized segregation model for concurrent dendritic, peritectic and eutectic solidification

Résumé

A microsegregation model for the solidification of binary alloys is presented. It accounts for diffusion in all phases, as well as nucleation undercooling and growth kinetics of the solidifying microstructures. It successively considers the occurrence of several phase transformations, including one or several peritectic reactions and one eutectic reaction. Volume-averaged mass conservation equations are coupled with a heat balance assuming a uniform temperature. The model is applied to simulate the solidification of Al–Ni atomized droplets. Coupled with an atomization model, it predicts recalescences, volume fractions of phases as well as average compositions during solidification. It eventually predicts the occurrence of a recalescence during the growth of each microstructure, and the progress of peritectic transformations consuming previously formed solid phases. The influence of several process parameters is evaluated. A comparison with experimental measurements is given, showing variation of phase fractions as a function of particle size for Al–Ni atomized droplets.

Domaines

Matériaux

Dates et versions

hal-00509262 , version 1 (11-08-2010)

Identifiants

Citer

Damien Tourret, Charles-André Gandin. A generalized segregation model for concurrent dendritic, peritectic and eutectic solidification. Acta Materialia, 2009, 57 (7), pp.Pages 2066-2079. ⟨10.1016/j.actamat.2009.01.002⟩. ⟨hal-00509262⟩
79 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More