| 摘要 |
The invention relates to a method for interrupted quenching of aluminum alloys with structural hardening. It comprises, starting from solution annealing: (a) rapid cooling by quenching until the product reaches a temperature of from 150 DEG to 260 DEG C.; (b) stopping the quenching operation for a period of from a few seconds to some tens of minutes (air cooling), and (c) resuming quenching to ambient temperature. Under these conditions, the result is quenched and tempered products which have mechanical characteristics close to state T6 and better than those of conventional state T73, with a very good degree of resistance to corrosion (flaking corrosion or stress corrosion) and a level of internal stresses which is substantially halved in comparison with conventional state T6. This treatment can be applied to all aluminum alloys of the 2000, 6000 and 7000 series (in accordance with the A.A.). |
