METHOD OF MAKING BILLETS FROM FAST-CRYSTALLISED ALUMINIUM ALLOYS Russian patent published in 2012 - IPC B22F3/14 C22C1/04 C22C21/00 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy and may be used for making deformed semis from refractory, high-strength aluminium alloys and those with special properties. Aluminium melt is overheated by at least 150°C to cast pellets at cooling rate of 500 to 10000 K/s at crystallisation, cooling being performed in fluid or gas. Pellet minimum size makes 0.4 mm while its maximum size varies from 1.6 mm to 10 mm. stepwise vacuum degassing is carried out in sealed capsules. Temperature of top degassing step does not exceed 480°C while holding interval thereat does not exceed 12 hours. To evacuate desorption products, capsule with pellets is held at the temperature 50-100°C lower than that of degassing top step. Note here that total holding time makes, at least, two hours. Pellets are compacted in capsules in press container heated to at least 400°C. Compact billet is planed.

EFFECT: low anisotropy, rules out pores and lamination.

3 cl, 2 tbl, 3 ex