Fabrication of Thin Heat Sinks by the Die Casting of Semisolid Al-25Si

摘要

The viability of casting heat sinks with thin fins using Al-25%Si was investigated, based on assessing cooling curves as well as fluidity tests and emissivity analyses of the resulting heat sinks. The fluidity, castability and emissivity of the semisolid die-cast Al-25%Si were excellent and superior to the results obtained using liquid die-cast A383, an aluminum alloy typically employed for casting. The cooling curves indicate that the significant latent heat of the Si in the alloy improves the fluidity and castability of the material. The addition of P did not greatly affect the refinement of primary Si in the alloy. These findings show that Al-25%Si is suitable for the die-casting of heat sinks with thin fins.