What's the Stiffest Material Besides Beryllium?

Why does it have to be a metal?

It has to be a type of metal because I wanted to design a laboratory shaker with very high natural frequency above 50Khz.

I would have to say, (without any knowledge of the application, and numerous other variables) you are possibly right with Ceramics. Material selection must be application dependent. Many factors must be accounted for, IE service life, environmental conditions, corrosion resistance, Machinability, cost, safety etc etc.. Your question is far to vague to make any informed or reliable material suggestion for your application.

Wanted to design a laboratory shaker (similar to a loud speaker) that has natural frequency above 50Khz.

Adamantium .

Is that similar to unobtanium?

Not exactly . Adamantium is an extremely rare alloy found almost exclusively in the bones and claws and bones of certain animals, specifically Wolverines and Sabertooths (Saberteeth ?), whereas Unobtainium is almost exclusively manufactured by KrisDel .

<...Unobtainium is almost exclusively manufactured by KrisDel...>

i think you are forgetting Upsidasium too! and much lighter......

the information is going to cost you...... the sacasm is free.....

Beryllium alloys provide a cheaper, more pliable alternative than pure beryllium. Of course they sacrifice some of the benefits.

Next up may be diamond, but I'm not sure about resonance frequency.

If you were to through in poissons ratio, I would think you're trying to design a really high priced tweeter like that of Revel's Salon 2 loudspeaker. Download their PDF about the Salon2 and I think you'll find the info you're after in their spreadsheet.

Jason

You are very close to what I wanted to design. I wanted to design a laboratory shaker (similar to a loud speaker) with high natural frequency above 50Khz.

Go to ceramic or glass ceramic and your option will open up to new world of materials. If you need help there I can provide you. In metal diamond is above and then you can look in different carbon crystal structure

All,

I wanted to learn how I can design a laboratory shaker that has an armature resonance above 50Khz. I don't know what is the best material selection for my moving armature that has very high resonance frequencies. Beryllium is very stiff and is very light in weight therefore will give me higher resonance frequency, but it is the poison that I want to get away. My next option is ceramic, but there are so many different kind of ceramic. I don't know what type of ceramic to use to give me this high resonance frequency that I'm looking for (above 50Khz).

Any consideration given to optional designs...?

Thinking of those ultrasonic cleaning baths ~ any chance of using metallic body affixed-to a large piezoelectric crystal of the desired frequency (resonance)...?

Just a stab-in-the-dark here...

I would suggest using carbon fiber unless your design precludes it. What shape(s) are you wanting to produce?

possibly a magnesium-Lithium alloy

it's as light as plastic but as stiff as metal. i don't know about it's resonance though.

LA141A is the most common commercial composition (Mg-14%Li-1%Al)