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Loads of fsa, sram and rotor have an alloy axle. Difference being it's the right alloy, drawn, machined, surface finished and heat treated properly. Not some random alloy made into a round ish shape.
BrickMan-
Difference being it's the right alloy, drawn, machined, surface finished and heat treated properly
And also 30mm. What seems like a small difference becomes huge when the torsional stiffness is proportional to the 4th power of diameter. 30mm aluminium alloy axles are fine, 24mm ones are a terrible idea. For a given load, the stress is reduced by about 60% using the larger axle. In the relevant region of the curve for 7075T6, that can easily be two orders of magnitude greater fatigue life.
gbj_tester
All/most the aliexpress cranksets have aluminium spindles (!) too, which no mainstream manufacturer does afaik. Have seen one where through normal usage the spindle has worn and snapped where it comes into contact with BB bearings, leaving customer looking like that famous pic of Fignon.