AlSiCuMg

AlSiCuMg refers to a family of aluminum alloys that combine silicon, copper, and magnesium with aluminum to improve castability, strength, and hardness. This designation is commonly associated with die-casting alloys in the Al-Si-Cu-Mg system, such as the A-series (for example A380, A360, and related grades). These alloys are designed for high integrity cast parts and intricate shapes used in automotive, electronics, and consumer goods.

Typical composition ranges (by weight) aim for relatively high silicon content to enhance fluidity and reduce shrinkage, with copper and magnesium added to enable precipitation hardening. A representative range is roughly silicon 7–12%, copper 2–4%, magnesium 0.2–1% (with trace elements such as iron, nickel, and manganese kept within standards). The exact composition varies by grade to balance castability, strength, and wear resistance.

Properties and processing: The silicon phase improves casting performance and surface finish, while copper and magnesium form strengthening precipitates upon heat treatment, yielding higher strength and hardness after aging. These alloys are usually heat-treated through solution treatment, quenching, and aging (often designated as T6 or similar). They exhibit good wear resistance and dimensional stability in castings, with moderate density comparable to other aluminum alloys. Weldability is limited and often requires special processes or filler materials; porosity control is important during casting.

Applications: Commonly used for engine blocks, cylinder heads, pump housings, valve covers, and other complex, high-volume components produced by die casting. The AlSiCuMg family is valued for its combination of good flow, good surface finish, and post-cast strength.