Patent ID: 9670567
Date: 2017-06-06
CPC Classifications: B22D,C22B,C22C,C22F,Y02P

Claim:
1. A manufacturing method for an unwrought aluminum alloy semi-finished product optionally comprising a rolling slab and/or an extrusion billet, said method comprising: (i) preparing a molten metal bath of an alloy having a composition comprising, percentage by weight: Zn: 0-12 Cu: 0-6 Mg: 0-6 Li: 0-3 Ag: 0-1 Si<0.5 Fe<0.5 optionally at least one of Cr, Zr, Mn, Hf, Ti, Sc, V, B, with a content <0.5, remainder aluminum, (ii) treating with ultrasound said molten metal bath in a furnace and/or a vessel using an immersed device comprising at least one ultrasound transmitter, (iii) transferring said molten metal bath so treated to a solidification device, (iv) vertical direct chill semi-continuous casting said treated molten metal bath, wherein a duration elapsing between an end of said treating with ultrasound of the liquid metal bath and an introduction of said liquid metal bath in the solidification device is at least a few minutes and optionally comprises at least three minutes.