Aluminum alloy forged material for automotive vehicles and production method for the material

摘要

An aluminum alloy forged material for automotive vehicles comprises 0.6˜1.2 mass % of Mg, 0.7˜1.5 mass % of Si, 0.1.˜0.5 mass % of Fe, 0.01˜0.1 mass % of Ti, 0.3˜1.0 mass % of Mn, at least one of 0.1˜0.4 mass % of Cr and 0.05˜0.2 mass % of Zr, a restricted amount of Cu that is less than or equal to 0.1 mass %, a restricted amount of Zn that is less than or equal to 0.05 mass %, a restricted amount of H that is less than or equal to 0.25 ml in 100 g Al and a remainder of Al and inevitably contained impurities, and the material includes precipitated crystalline particles among which the largest one has a maximum equivalent circle diameter equal to or less than 8 μm and an area ratio of the precipitated crystalline particles is equal to or less than 3.6%.

主权项

1. An aluminum alloy forged material, comprising aluminum, and by mass percent:
from 0.6˜1.2% of Mg; from 0.7˜1.5% of Si; from 0.1˜0.5% of Fe; from 0.01˜0.1% of Ti; from 0.3˜1.0% of Mn; at least one of 0.1˜0.4% of Cr and 0.05˜0.2% of Zr; a restricted amount of Cu that is less than or equal to 0.1%; a restricted amount of Zn that is less than or equal to 0.05%; and a restricted amount of H that is less than or equal to 0.25 ml in 100 g Al, wherein the aluminum alloy forged material includes precipitated crystalline particles among which a largest precipitated crystalline particle has a maximum equivalent circle diameter of less than or equal to 8 μm and has a tensile strength larger than or equal to 420 MPa, and an area ratio of the precipitated crystalline particles is equal to or less than 3.6%.