Provided is an automobile part comprising a 7000-series aluminum alloy sheet and provided with both strength and stress corrosion cracking resistance. The automobile part is configured from a 7000-series aluminum alloy sheet having a specific composition, and after artificial aging processing, the grain size distribution of precipitates evaluated by means of a small angle x-ray scattering 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 350 MPa, high ductility, and SCC resistance. Also, the automobile part is configured from a 7000-series aluminum alloy sheet 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 300,000× 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 350 MPa, high ductility, and SCC resistance.
ALUMINUM ALLOY AUTOMOBILE PART
2015-08-06
Patent
Electronic Resource
English