Improved zinc base alloys containing titanium

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 18/02 (2006.01)

Patent

CA 2228983

The invention includes the discovery that the addition of titanium to a zinc based alloy containing epsilon as a primary phase results in an increase in tensile and compressive strength of the alloy. The alloy can be used in gravity, permanent mold or die casting processes to mold components or tooling. In a preferred embodiment, 0.01-0.1 weight percent titanium is added to a zinc based alloy containing 3-12 weight percent copper, 2-5 weight percent aluminum, minor constituents and the balance zinc. The discovered behavior was unexpected and has not previously been reported. The cause of such behavior is unknown.

L'invention découle de la découverte que l'addition de titane à un alliage de zinc contenant la phase epsilon comme phase primaire entraîne une augmentation de la résistance à la traction et de la résistance à la compression de l'alliage. L'alliage peut être utilisé dans les procédés de moulage par gravité, de moulage en coquille ou de moulage sous pression pour produire des pièces ou des outils. Dans la réalisation préférée de cette invention, on ajoute 0,01-0,1 % en poids de titane à un alliage de zinc composé de 3-12 % en poids de cuivre, de 2-5 % en poids d'aluminium et de constituants secondaires, le reste étant constitué de zinc. Ce comportement inattendu n'avait pas été signalé auparavant. La cause de ce comportement est inconnu.

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