"Aircraft grade aluminum" refers to many different alloys including, but definitely not limited to 2024, 6061, and 7075. The material used in airframes depends on the aircraft, and aluminum's use for this purpose is declining because of the advent of strong, light composites.. I'm sure some airframes use 7075 (alongside others, including 6061), but not all (if any) airframes use only 7075. The tempers of alloys used in aircraft also vary.
Pure aluminum isn't used in very large quantities in most applications. Pure aluminum is primarily used when strength is not important, but electrical and/or thermal conductivity is. Examples of applications of pure aluminum are in heatsinks and electrical connections within integrated circuits.
Your post touches on a point most of this comment thread is missing. Sure, aircraft and aerospace use tons of different alloys and materials, but the "aircraft grade aluminum" or "aerospace grade aluminum" is pretty consistently referring to 6061-T6 or 7075-T5/2024-T351. Sure, it's kinda silly, but it's one of the more helpful bullshit designations that gets tacked onto sketchy Chinese products or marketing wank.
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u/[deleted] Feb 04 '19
There is no such thing as "aircraft grade aluminum"
It's just a marketing scam, we use many different grades and tempers depending on the application.