| 摘要 |
Provided is an automobile part comprising a 7000-series aluminum alloy rolled plate and provided with both strength and stress corrosion cracking resistance. The automobile part is configured from a 7000-series aluminum alloy rolled plate having a specific composition, and after artificial aging processing, the grain size distribution of minute grains evaluated by means of a small angle x-ray scattering technique among the crystal grains of the aluminum alloy plate and the normalized dispersion of the grain size distribution are controlled, resulting in being simultaneously provided with high strength in the form of an 0.2% proof stress of at least 350MPa, high ductility, and SCC resistance. Also, the automobile part is configured from a 7000-series aluminum alloy rolled plate having a specific composition, and after artificial aging processing, a specific number density of nanosized precipitates are caused to be present as measured by a transmission electron microscope at 300,000x magnification in the crystal grains of the aluminum alloy plate, resulting in being simultaneously provided with high strength in the form of an 0.2% proof stress of at least 350MPa, high ductility, and SCC resistance. |
