| 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>… |
