The company has developed a lightweight, tough, high-rigidity and high-heat-resistant aluminum alloy forged wheel. The aluminum alloy forged wheel of the present invention includes a hub portion for attaching an axle, a disk portion provided on the periphery of the hub portion, and a rim portion provided on the periphery of the disk portion, at least one of the disk portion and the rim portion Or both are obtained by forging a billet obtained by casting an aluminum alloy containing Si: 9.0 to 12.5 mass %, Cu: 0.5 to 3.4 mass %, Mg: 0.2 to 0.9 mass %, Fe: 0.7 mass % or less, Ti: 0.005-0.15 mass %, Sr: 0.01-0.15 mass %, Sb: 0.01-0.20 mass %, Ca: 10-200 mass ppm, Na: 10-200 mass ppm Sr, Sb, Any of Ca and Na, the balance is Al and inevitable impurities, and the width of the band-shaped region where Si particles are sparse in the metallographic structure of one or both of the disk portion and the rim portion is 20 μm The average grain size of the eutectic Si is 5 μm or less.
The company has developed a lightweight, tough, high-rigidity and high-heat-resistant aluminum alloy forged wheel. The aluminum alloy forged wheel of the present invention includes a hub portion for attaching an axle, a disk portion provided on the periphery of the hub portion, and a rim portion provided on the periphery of the disk portion, at least one of the disk portion and the rim portion Or both are obtained by forging a billet obtained by casting an aluminum alloy containing Si: 9.0 to 12.5 mass %, Cu: 0.5 to 3.4 mass %, Mg: 0.2 to 0.9 mass %, Fe: 0.7 mass % or less, Ti: 0.005-0.15 mass %, Sr: 0.01-0.15 mass %, Sb: 0.01-0.20 mass %, Ca: 10-200 mass ppm, Na: 10-200 mass ppm Sr, Sb, Any of Ca and Na, the balance is Al and inevitable impurities, and the width of the band-shaped region where Si particles are sparse in the metallographic structure of one or both of the disk portion and the rim portion is 20 μm The average grain size of the eutectic Si is 5 μm or less.
