Aluminium brass is a technically rather uncommon term for high-strength and partly seawater-resistant copper-zinc cast and wrought alloys with 55–66% copper, up to 7% aluminium, up to 4.5% iron, and 5% manganese. Aluminium bronze is technically correct as bronze, a zinc-free copper-tin casting alloy with aluminium content.
The term "special brass" is much more common for this, which then also includes alloys that add further characteristic elements to the copper-zinc base. In addition to the already mentioned elements of iron and manganese, lead, nickel and silicon can also be found as alloy components.
Due to their aluminium content, which is susceptible to oxidation at the usual melting temperatures in the range of 900 °C, the alloys require careful melting and melting treatment. Even when potting, attention must be paid to any oxides forming.
7000 series 7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloy. Most 7000 series alloys include magnesium and copper as well. +7000 series aluminium alloy nominal composition (% weight) and applicationsAlloyAl contentsAlloying elementsUses and refs700593.3Zn 4.5; Mg 1.4; Mn 0.45; Cr 0.13; Zr 0.14; Ti 0.04Extrusions701093.3Zn 6.2; Mg 2.35; Cu 1.7; Zr 0.1;Aerospace702291.1Zn 4.7; Mg 3.1; Mn 0.2; Cu 0.7; Cr 0.2;plate, moldsSahamit machinery 7022703485.7Zn 11.0; Mg 2.3; Cu 1.0Ultimate tensile strength 750 MPa703992.3Zn 4.0; Mg 3.3; Mn 0.2; Cr 0.2Aerospace armour plate704988.1Zn 7.7; Mg 2.45; Cu 1.6; Cr 0.15Universal, aerospace705089.0Zn 6.2; Mg 2.3; Cu 2.3; Zr 0.1Universal, aerospace705587.2Zn 8.0; Mg 2.3; Cu 2.3; Zr 0.1Plate, extrusions, aerospace706588.5Zn 7.7; Mg 1.6; Cu 2.1; Zr 0.1Plate, aerospace706887.6Zn 7.8; Mg 2.5; Cu 2.0; Zr 0.12Aerospace, Ultimate tensile strength 710 MPa707299.0Zn 1.0Sheet, foil7075 & 717590.0Zn 5.6; Mg 2.5; Cu 1.6; Cr 0.23Universal, aerospace, forgings707991.4Zn 4.3; Mg 3.3; Cu 0.6; Mn 0.2; Cr 0.15 –708589.4Zn 7.5; Mg 1.5; Cu 1.6Thick plate, aerospace7090Al-Zn-Mg-Cu with Co 1.5%high strength, ductility and resistance to stress corrosion cracking7091Al-Zn-Mg-Cu with Co 0.4%high strength, ductility and resistance to stress corrosion cracking709386.7Zn 9.0; Mg 2.5; Cu 1.5; O 0.2; Zr 0.1Aerospace711693.7Zn 4.5; Mg 1; Cu 0.8Heat-treatable712993.2Zn 4.5; Mg 1.6; Cu 0.7 –715089.05Zn 6.4; Mg 2.35; Cu 2.2; O 0.2; Zr 0.1Aerospace717888.1Zn 6.8; Mg 2.7; Cu 2.0; Cr 0.26Universal, aerospace725587.5Zn 8.0; Mg 2.1; Cu 2.3; Zr 0.1Plate, aerospace747590.3Zn 5.7; Mg 2.3; Si 1.5; Cr 0.22Universal, aerospace
References
Further reading
Publication series of the DKI, Berlin, number L5 "Copper-Zinc alloys". Foundry lexicon. 17. Edition, Schiele and Schön, Berlin,