High-strength Alloy 713.0 is an aluminum-zinc-magnesium alloy that ages at room temperature and is ideal for castings too intricate for heat treatment. Its high yield strength, ductility, impact resistance and other favorable final mechanical properties are achieved by self-aging for 21 days at room temperature.
When faster aging is necessary, the same final properties can be obtained by heating castings for 16 hours at 250F (121C). Because no solution heat treating, quenching or artificial aging strengthening treatments (which often produce internal stresses) are required, larger and more intricate castings can be produced with 713.0 than with most other alloys that are not self-aging. It achieves tensile and yield strengths comparable to non-self-aging alloys.
Alloy 713.0 is dimensionally stable and will not expand or grow during aging as is common with other alloys containing copper and silicon as major alloying elements. After brazing, natural aging will return the alloy’s original strength.
Automotive parts, pumps, trailer parts and mining equipment are regularly cast of this alloy.
Castability
Castability of 713.0 is fair to good; it is similar to that of other zinc-magnesium type aluminum alloys. No particular foundry techniques other than normal good practices are necessary. This alloy has a narrower solidification range than most common foundry alloys. Heavier gates and risers should be used to compensate for its higher shrinkage rate. When gates and risers are adequate, pressure-tight parts can be cast successfully.
Machinability
Alloy 713.0 has excellent machining characteristics.
Weldability
Common welding methods are fair for joining. The alloy is recommended for brazing, and techniques standard for brazing wrought alloys can be employed.
Finishing
Excellent finishes are produced when Alloy 713.0 is polished. The alloy also takes a good anodized finish that is light golden yellow in appearance.
Corrosion Resistance
Corrosion resistance of this alloy is rated good.
