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Abstract

The present invention relates to an aluminum alloy for the manufacture of thick blocks comprising (as a percentage by weight), Zn: 5.3-5.9%, Mg: 0.8-1.8%, Cu: <0.2%, Zr: 0.05 to 0.12%, Ti<0.15%, Mn<0.1%, Cr<0.1%, Si<0.15%, Fe<0.20%, impurities having an individual content of <0.05% each and <0.15% in total, the rest aluminum. The alloy may be used in a process comprising the steps of:

(a) casting a thick block of an alloy according to the invention(b) solution heat treating said cast block at a temperature of 500 to 560° C. for 10 minutes to 20 hours,(c) cooling said solution heat treated block to a temperature below 100° C.,(d) tempering said solution heat treated and cooled block by heating to 120 to 170° C. for 4 to 48 hours,

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First Claim