What defines a hypereutectic aluminum alloy?

A hypereutectic aluminum alloy is characterized by its higher silicon content compared to conventional aluminum alloys. Specifically, this type of alloy contains more than 12% silicon by weight, which significantly influences its properties. The increased silicon content enhances wear resistance, reduces thermal expansion, and improves fluidity, making these alloys ideal for applications like engine components, where strength and durability are critical.

In contrast, lower silicon content would categorize an alloy as hypoeutectic or within the eutectic range, which has different characteristics. The statements about non-corrosiveness and thermal conductivity do not specifically define hypereutectic aluminum alloys, as those traits can apply to various types of aluminum alloys and not exclusively to those with higher silicon content.