Method for producing an aluminum-titanium-boron prealloy for...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/02 (2006.01) C22C 1/03 (2006.01) C22C 21/00 (2006.01)

Patent

CA 2394485

The invention relates to a method for producing a grain refiner on the basis of an aluminum-titanium-boron prealloy. According to the inventive method, starting materials that contain Ti and B are introduced into an aluminum melt while TiB2 particles are formed, and the prealloy melt produced is allowed to solidify. The prealloy is set in motion at a temperature between the liquidus temperature (TLAl3Ti) of the Al3Ti phase and the solidus temperature (TSV) of the prealloy for a period (.DELTA.td) sufficient to disperse the TiB2 particles in the melt. The melt is simultaneously cooled off at a first rate of cooling (v1) so that the TiB2 particles function as the nuclei for the Al3Ti phase that is formed below the liquidus temperature (TLAl3Ti) and the surface of the TiB2 particles is at least partially covered by an Al3Ti coating. The prealloy is then cooled off to a temperature below the solidus temperature (TSV) of the prealloy at a second rate of cooling (v2) that is higher than the first rate of cooling (v1). The inventive method is especially useful in the production of grain refiners for the grain refinement of aluminum and aluminum alloys.

Procédé de fabrication d'un moyen d'affinage du grain sur la base d'un préalliage d'aluminium-titane-bore, qui consiste à introduire des matières de départ contenant Ti et B dans une masse d'aluminium fondue, ce qui provoque la formation de particules de TiB¿2?, et à laisser durcir cette masse fondue de préalliage. Ledit préalliage est mis en mouvement, lorsqu'il se trouve entre la température liquidus (T?L¿¿Al3Ti?) de la phase Al¿3?Ti et la température solidus (T?S¿?V¿) du préalliage, pendant une durée (.DELTA.t¿d?) suffisante pour que les particules de TiB¿2? se dispersent dans ledit préalliage, et simultanément refroidi à une première vitesse de refroidissement (v¿1?), si bien que les particules de TiB¿2? agissent comme des germes pour la phase Al¿3?Ti se formant au-dessous de la température liquidus (T?L¿¿Al3Ti?) et que la surface des particules de TiB¿2? est au moins en partie couverte par une couche de Al¿3?Ti. Ledit préalliage est ensuite refroidi au-dessous de la température solidus (T?S¿¿V?) à une deuxième vitesse de refroidissement (v¿2?) plus élevée que la première vitesse de refroidissement (v¿1?). Ledit procédé est particulièrement approprié pour la fabrication de moyens d'affinage de grain pour l'aluminium et les alliages d'aluminium.

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