| 摘要 |
Al-based alloys of the 7000 series which have a high modulus (E >/= 74 GPa), a high mechanical strength (R0.2 >/= 530 MPa in the lengthwise direction), a good tenacity (KIC, lengthwise direction > 20 MPa 2ROOT m) and a good corrosion resistance under (O pressure >/= 250 MPa in the short transverse direction, lifetime >/= 30 days - ASTM Standard G 38-73). <??>The alloy according to the invention corresponds to the following weight composition: from 5.5 to 8.45% of Zr from 2 to 3.5% Mg from 0.5 to 2.5% Cu up to 0.5% Fe up to 0.5% Si other elements </= 0.05% each and up to 0.15% in all with 0.1 </= Zr </= 0.5% 0.3 </= Cr </= 0.6% 0.3 </= Mn </= 1.1% <??>It is preferably produced by the following process: a) a massive body which has the composition claimed above is formed by spray-deposition, b) this body is converted into a wrought product between 300 and 450 DEG C and then optionally when cold c) the wrought product is heat-treated by dissolving, quenching and annealing to a T6 or T7 state. <IMAGE> |
