Metal alloy compositions and process

Details Metal alloy compositions and process Metal alloy compositions and process

B - Operations, Transporting

22

D

B22D 27/00 (2006.01) C22F 1/00 (2006.01)

Patent

CA 2422696

A skinless metal alloy composition free of entrapped gas and comprising primary solid discrete degenerate dendrites homogenously dispersed within a secondary phase is formed by process wherein the metal alloy is heated in a vessel to render it a liquid (10). The liquid is then rapidly cooled while vigorously agitating it (12) under conditions to avoid entrapment of gas while forming solid nuclei (14) homogenously distributed in the liquid. Agitation then is ceased when the liquid contains a small fraction solid or the liquid- solid alloy is removed from the source of agitation (12) while cooling is continued to form the primary solid discrete degenerate dendrites in liquid secondary phase. The solid-liquid mixture then can be formed such as by casting.

Cette invention concerne une composition d'alliage métallique sans peau, exempte d'inclusions de gaz et comprenant des dendrites solides primaires dégradées et séparées, dispersées de façon homogène au sein d'une phase secondaire. On obtient cette composition métallique en chauffant l'alliage métallique dans un récipient jusqu'à sa liquéfaction (10). On fait ensuite refroidir rapidement le liquide tout en l'agitant (12) vigoureusement de manière à éviter les inclusions de gaz et à former des noyaux solides (14) répartis de manière homogène dans le liquide. L'agitation est arrêtée lorsque le liquide renferme une petite fraction solide ou que l'alliage liquide-solide est retiré de la zone d'agitation (12) cependant que l'on poursuit le refroidissement de lanière à obtenir les dendrites solides primaires dégradées séparées dans la phase secondaire liquide. Le mélange solide-liquide peut alors être formé, par exemple par coulage.

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