Quote:
Originally Posted by CapriRacer
One of the quirks of nature is that most metals have the same strength-density. That is for a given weight, the breaking strength is the same regardless of the material. So while aluminum is lighter, it is also less strong, so more of it has to be used.
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This is definitely not true.
Mild carbon steel has a tensile strength of ~500 MPa (73 000 psi) for a density of ~7,9 g/cm^3. On the other hand, pure Titanium (not even alloyed) with a density of 4,5 g/cm^3 has a tensile strength of 434 MPa. It has 87% of the strength of mild steel for 56% of its weight and heat treated aluminum can have more than 60% of the strength of steel for 30% of its weight.