titanium vs. aluminum

titanium vs. aluminum

Post by Travis Freudenber » Tue, 30 Mar 1999 04:00:00


So what's the point of getting a titanium bolt?  I thought the only real
difference between titanium and aluminum was that titanium weighs a tad
less and costs a lot more.  How much difference is a lighter bolt going
to make?  What comes after this? Berilium .45 frames? (Sounds
ridiculous, but a mountain bike company came out with a bike frame made
of berilium last year.)
 
 
 

titanium vs. aluminum

Post by DTyr » Wed, 31 Mar 1999 04:00:00

Titanium is much stronger than aluminum, closer to steel I believe.  Don't
quote me on this, but I believe it has a lower coeffecient of friction as
well.  Worth the money...no...but it's really cool to have parts made of
*** metals.
Quote:

>So what's the point of getting a titanium bolt?  I thought the only real
>difference between titanium and aluminum was that titanium weighs a tad
>less and costs a lot more.  How much difference is a lighter bolt going
>to make?  What comes after this? Berilium .45 frames? (Sounds
>ridiculous, but a mountain bike company came out with a bike frame made
>of berilium last year.)


 
 
 

titanium vs. aluminum

Post by Edward Ka » Wed, 31 Mar 1999 04:00:00

: So what's the point of getting a titanium bolt?  I thought the only real
: difference between titanium and aluminum was that titanium weighs a tad
: less and costs a lot more.  How much difference is a lighter bolt going
: to make?  What comes after this? Berilium .45 frames? (Sounds
: ridiculous, but a mountain bike company came out with a bike frame made
: of berilium last year.)

        Titanium weighs more than aluminum.
        Titanium costs more than aluminum.
        Titanium has a higher tensile and fatigue strength than Aluminum.

        An aluminum bolt in the exact same shape as a titanium bolt
        weighs considerably less. There is no point in having a
        titanium bolt.

        Beryllium ceramic frames were introduced many years ago (I think
as long ago as '93 or '94). Use of Beryllium ceramics in a paintball gun
is illogical, since there is no part of a paintball gun that requires the
extremely low elasticity of the material.

                                                                -Edward

 
 
 

titanium vs. aluminum

Post by Jameel Akar » Wed, 31 Mar 1999 04:00:00

Quote:

> Titanium is much stronger than aluminum, closer to steel I believe.  Don't

        I don't have a materials book handy, but Ti is stronger than most
steels (higher tensile strength).  Makes it great for***ing rods.

Quote:
> well.  Worth the money...no...but it's really cool to have parts made of
> *** metals.

        Hell yeah.  Some cobalt parts would be real nice looking.  Or
maybe a tungsten valve seat.  That sucker would never wear out.  A little
hard to manufacture, yes.  I think vacuum-depostited niobium would look
really cool instead of anodizing- the color would vary from light blue to
dark purple depending on the thickness.

Quote:

> >to make?  What comes after this? Berilium .45 frames? (Sounds
> >ridiculous, but a mountain bike company came out with a bike frame made
> >of berilium last year.)

        Boy would I love to take a torch to that and watch it burn.  It'd
be real pretty- I think Be burns bright red.

------------
Jameel Akari
Insert witty comment here
------------
<http://SportToday.org/~jakari>
ICQ: 27182003

 
 
 

titanium vs. aluminum

Post by Matt Windel » Wed, 31 Mar 1999 04:00:00

I have a materials book right here.

Titanium yield strengths range from 25-160 ksi
Steel yield strengths range from 42.8-230 ksi
Stainless Steel yield strengths range from 25-240 ksi
Aluminum yield strengths range from 5-73 ksi

So we see that steel and Ti are very close in strengths.
Ti is approximately half the density of steel
Aluminum is approx. 1/3 the density of steel

Hardness is directly related to tensile strengths so a Ti bolt would
probably last longer than an Aluminum one.

Quote:


> > Titanium is much stronger than aluminum, closer to steel I believe.  Don't

>         I don't have a materials book handy, but Ti is stronger than most
> steels (higher tensile strength).  Makes it great for***ing rods.

> > well.  Worth the money...no...but it's really cool to have parts made of
> > *** metals.

>         Hell yeah.  Some cobalt parts would be real nice looking.  Or
> maybe a tungsten valve seat.  That sucker would never wear out.  A little
> hard to manufacture, yes.  I think vacuum-depostited niobium would look
> really cool instead of anodizing- the color would vary from light blue to
> dark purple depending on the thickness.


> > >to make?  What comes after this? Berilium .45 frames? (Sounds
> > >ridiculous, but a mountain bike company came out with a bike frame made
> > >of berilium last year.)

>         Boy would I love to take a torch to that and watch it burn.  It'd
> be real pretty- I think Be burns bright red.

> ------------
> Jameel Akari
> Insert witty comment here
> ------------
> <http://SportToday.org/~jakari>
> ICQ: 27182003

 
 
 

titanium vs. aluminum

Post by -phran » Wed, 31 Mar 1999 04:00:00

Quote:
> Beryllium ceramic frames were introduced many years ago (I think
> as long ago as '93 or '94).

There's a pic of one either the Oct or Nov 1991 issue of Bicycling.

-phranc