Heat treatment of hypereutectic Al-Si alloys

摘要

Heat treatment for casting of hypereutectic aluminum - silicon alloy applies a local heat at critical points (A-C) where there will be a high concentration of mechanical forces when in use. Heat is applied temporarily to heat metal to the melting point of primary silicon crystals and quenched. Molten zone is at a maximum depth of 1 mm, held at the melting temperature for a maximum of 3 secs. under a protective gas, using a cold welding process.