Aluminum is F grade allomantic material.

Pronounced aluminyum

Titanium is awesome, though. Has similar corrosion properties to aluminum (in that it only oxidizes on the surface), is similar in strength to iron/steel, but is only about 60% of the weight iron. So it's lighter.
Plus if you mix in molybdenum and I think some nickel, you can have yourself a very long lasting spring that won't sag like steel springs after several years.
Main downside is it's so expensive compared to iron :(

Aluminium doesn't get stronger on the welds like steel does, it gets weaker. So if you screw them up, you end up with a two part bike

And now I'm back to looking at steel (and titanium) adventure hardtails...

not to defend Alluminium (bleh), but that's likely a production error, bad hydroforming, bad welds... at least it's not CF!

having no fatigue limit is a bitch.

But seriously making the body pannels out of stainless steel and the frame out of aluminum would be a hilarious joke among 2nd year engineering students about what happens when you let the sales people make the specs.

I’ve often heard that Diamond Is Unbreakable

Pretty sure neutron star matter is the hardest metal buddy

Found the astronomer.

Dragonforce is the hardest metal known to man, it is the metal you use to break diamond

I thought carbon fibre was the hardest metal

I prefer all my farm tools and weapons to be made out of iridium personally, but that’s just me

Are you dense?