The density of titanium alloy is bigger than aluminum alloy, but smaller than steel.
Titanium alloy frame is lighter than aluminum alloy frame, however, because a larger than aluminum alloy, the strength of the titanium alloy made of titanium alloy frame can minimize while guarantee the strength of the materials, so although is greater than the density of aluminum alloy, titanium alloy product titanium frame is more lighter than aluminium frame.
However, titanium alloy is not as strong as carbon fiber, and its density is much higher than carbon fiber. Titanium frame will be much heavier than carbon frame of the same strength. And the intensity of manufacturing frame can't give up pursuit of strong quantitative, also could not consider weight devotion to strength, so in fact than titanium and carbon aircraft has any advantage in terms of strength and weight.
In addition to weight and strength, the most intuitive measures of a frame include rigidity. The rigidity of titanium alloy is not very high originally, and the rigidity of lightweight titanium frame is lower, which cannot be compared with high rigid carbon frame.
Any object after stress will produce elastic deformation, in the same, but different bodies after deformation amplitude, high deformation small, rigid, is usually said "hard", low rigidity and large deformation is usually said "soft".
Object stress besides elastic deformation will there be any plastic deformation (deformation) is completely, some objects by a certain force will appear after the size of plastic deformation, and some objects in the same size force appears only when the elastic deformation and force of restorable after disappear, so the former intensity is small, the strength is big, the latter strength is usually said "toughness", presumably.
