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Abstract

Provided are an Al—Mg—Si based aluminum alloy forging excellent in mechanical properties in room temperature and hardly causing recrystallized grains and a production method thereof. An aluminum alloy forging consists of: Cu: 0.15 mass % to 1.0 mass %, Mg: 0.6 mass % to 1.15 mass %; Si: 0.95 mass % to 1.25 mass %; Mn: 0.4 mass % to 0.6 mass %; Fe: 0.2 mass % to 0.3 mass %; Cr: 0.11 mass % to 0.25 mass %; Ti: 0.012 mass % to 0.035 mass %; B: 0.0001 mass % to 0.03 mass %; Zn: 0.25 mass % or less; Zr: 0.05 mass % or less; and the balance being aluminum and inevitable impurities. The number of intermetallic compounds of Mg₂Si with a minor axis of 0.5 μm or more present in a visual field area of 1.5815 mm² is 100 or less when a sectional structure of the aluminum alloy forging is observed at a magnification of 1,000 times.

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First Claim