General question on Carbon fiber tonearms versus aluminum

To the technical people: What roles do material hardness and strength play when it comes to tonearm material? If I am correct, carbon fiber is stronger than yet not as hard as aluminum; aluminum is harder than but not as strong as carbon fiber.

I have only tried aluminum and titanium nitride arms, so can't comment on the comparison between aluminum and carbon fiber.

I think the comparison between CF cantilevers and aluminum tube cantilevers is a valid illustration here. CF damps more, so has a more smooth, but dead sound compared to aluminum. I don’t care for CF canti’s..

Ive found the same to be true for tonearms. There is a certain muting of dynamics from CF tonearms.

My best tonearm is a titanium tapered tube. Don’t care for magnesium. I would LOVE to finish my new Boron Carbide tonearm soon. I think that will be a winner.

Carbon fiber definitely sounds better on odd days of the month, and aluminum on even days.  This is especially true when you hear the tonearm installed on a turntable you don't own yourself, with  a cartridge you've never heard before, and played through electronics that are new to you.  The best way to get an accurate comparison on material performance!

We do every thing we can to insure that the only movement/vibration that occurs is the tiny magnet or coil within the cartridge.

This transcends throughout the system all the way to the cantilever material: less weight, higher stiffness best.

Tonearms with maximum stiffness: Carbon easily wins over aluminum, it’s calculated differences are shown here:

https://dragonplate.com/carbon-fiber-vs-aluminum

Carbon is -40% density; +70% specific stiffness +289% specific tensile strength.

To achieve a total tonearm weight, to meet a design goal, carbon can be thicker. In any material, thickness increases strength.

My 12.5" effective length arm is Carbon, and the designer can use a greater thickness to achieve his design goal. So, carbon in equal thickness is much stiffer, increase it’s thickness, it is extremely stiffer.

Carbon is the viagra of tonearms.

Looked at the other way, to keep weight down, aluminum must be thinner, thus weaker, thus less damping, less attenuation of vibration.