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Abstract

An aluminum alloy forging formed of an aluminum alloy containing Cu: 0.15% to 1.0%, Mg: 0.6% to 1.35%, Si: 0.95% to 1.45%, Mn: 0.4% to 0.6%, Fe: 0.2% to 0.7%, Cr: 0.05% to 0.35%, Ti: 0.012% to 0.035%, B: 0.0001% to 0.03%, Zn: 0.25% or less, Zr: 0.05% or less (all % given by mass), and a remainder consisting of Al and inevitable impurities, in which a crystal grain diameter where a maximum principal stress is applied is 20 to 40 μm. The aluminum alloy forging has a structure in which an average shortest distance from a precipitate having a major axis of 0.1 μm or more to a crystal grain boundary in a cross-sectional structure with a visual field area of 8,000 μm² is in a range of 0.1 μm to 2.0 μm, and a fatigue life at a load stress of 150 MPa is 6×10⁶.

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