Alloy selection is one of the most critical decisions in high-pressure die casting. The choice between ADC12, A380, and AlSi10Mg directly influences mold life, production efficiency, and the final mechanical and corrosion performance of the casting. Understanding these differences helps engineers balance cost, durability, and part quality.
ADC12 (a Japanese standard alloy closely related to A383) contains relatively high silicon (around 10–12%) and moderate copper. Its excellent fluidity makes it ideal for complex, thin-wall geometries and intricate heat-sink designs. The high silicon content, however, increases the presence of hard primary silicon particles, which accelerate abrasive wear on the die cavity and cores. Mold life is generally good but shorter than lower-silicon alloys when high production volumes are required.
A380 remains the most widely used die-casting alloy in North America. It offers a strong combination of fluidity, strength, and pressure tightness. Compared with ADC12, A380 typically has slightly lower silicon and higher copper. The elevated copper improves as-cast strength and hardness but increases the tendency for die soldering and thermal fatigue cracking. Over time this leads to more frequent die maintenance and higher tooling costs, especially in high-volume runs.
AlSi10Mg contains lower copper and higher magnesium. It delivers superior corrosion resistance, better elongation, and good response to heat treatment (T6). These properties make it attractive for structural and automotive components that require higher ductility or weldability. From a mold-wear perspective, AlSi10Mg is generally less abrasive than high-silicon alloys, but magnesium can increase the risk of die soldering if process parameters (temperature, release agent, and dwell time) are not carefully controlled.
In terms of part performance, ADC12 and A380 provide high strength and excellent castability for non-structural or moderately loaded components. AlSi10Mg offers better toughness and corrosion resistance, making it preferable when parts face dynamic loads or outdoor exposure. Thermal conductivity is highest in lower-silicon variants, which benefits heat-dissipation applications.
At our facility, we regularly evaluate alloy selection against both mold-life economics and final part requirements. By matching the alloy to the specific application—whether thin-wall electronics housings, structural brackets, or corrosion-sensitive components—we help customers extend die life while achieving consistent mechanical performance. If you are currently choosing between ADC12, A380, or AlSi10Mg for a new project, share your drawing and performance targets; we can recommend the most balanced solution for both mold longevity and part quality.