Formation of locked-lamellar grains in a slightly hypoeutectic Al-Al2Cu alloy during thin-sample directional solidification - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Formation of locked-lamellar grains in a slightly hypoeutectic Al-Al2Cu alloy during thin-sample directional solidification

Résumé

Abstract We studied the formation and growth of locked-lamellar microstructures in a thin sample of a slightly hypoeutectic Al-Al2Cu alloy. The coupled-growth dynamics, including early stages and steady-state regimes, was observed optically in real time during directional solidification. The orientation of the α (Al) and θ (Al2Cu) crystals was measured ex situ in a series of eutectic grains by X-ray Laue microdiffraction. A nucleation event of a θ crystal on a pre-existing α crystal, and the subsequent growth of a eutectic grain with a type-C orientation relationship, that is, with a coincidence of {123}-α and {100}-θ planes, were observed in situ. In type-C eutectic grains, lamellar locking occurred parallel to the low-energy coincidence plane. A regular ( floating ) coupled-growth dynamics was observed in misoriented eutectic grains.
Fichier principal
Vignette du fichier
Medjkoune_2023_IOP_Conf._Ser. _Mater._Sci._Eng._1274_012037.pdf (1.06 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04196621 , version 1 (05-09-2023)

Identifiants

Citer

Mehdi Medjkoune, Sabine Bottin-Rousseau, Laurent Carroz, Geoffroy Prévot, Bernard Croset, et al.. Formation of locked-lamellar grains in a slightly hypoeutectic Al-Al2Cu alloy during thin-sample directional solidification. 6th International Conference on Advances in Solidification Processes, Jun 2022, Le Bischenberg, France. pp.012037, ⟨10.1088/1757-899X/1274/1/012037⟩. ⟨hal-04196621⟩
21 Consultations
9 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More