Enhanced dendrite fragmentation through the peritectic reaction in TiAl-based alloys - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Intermetallics Année : 2017

Enhanced dendrite fragmentation through the peritectic reaction in TiAl-based alloys

G. Martin
D. Daloz
Julien Zollinger

Résumé

Grain size evolution for γ-TiAl based alloys with aluminum content ranging from 43 to 52 at.% were cast at constant superheat and characterized. Experiments show that the sooner the peritectic phase transition occurs, the finer are the equiaxed grains. An accurate estimate of the number of surviving dendrite fragments and fragmentation rate is performed, which can be used to predict the position of the columnar-to-equiaxed transition in the cast ingots. For alloys solidifying with the β pro-peritectic primary phase, the fragmentation rate significantly increases when the onset of the peritectic reaction is earlier. A mechanism based on the peritectic reaction is proposed for the observed grain refinement and is discussed on the basis of the fluid flow, mushy zone permeability and the influence of the peritectic reaction.

Domaines

Matériaux
Fichier principal
Vignette du fichier
Peritectic_and_fragmentation_VRev.pdf (14.52 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02353584 , version 1 (07-11-2019)

Identifiants

Citer

N.T. T Reilly, B. Rouat, G. Martin, D. Daloz, Julien Zollinger. Enhanced dendrite fragmentation through the peritectic reaction in TiAl-based alloys. Intermetallics, 2017, 86, pp.126-133. ⟨10.1016/j.intermet.2017.03.022⟩. ⟨hal-02353584⟩
123 Consultations
163 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More