Re: What Is Alloy?

nick c <nchen711@xxxxxxxxxxxxx> wrote in
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Agent Smith wrote:
nick c <nchen711@xxxxxxxxxxxxx> wrote in
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Agent Smith wrote:
nick c <nchen711@xxxxxxxxxxxxxxx> wrote in
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Agent Smith wrote:
Does anybody know the name (or names) of the famous alloy from
which high- end racing components are made? :] Whenever I see
it referred to in books and articles, it is just called "alloy,"
but apparently there's a whole branch of engineering that's
embodied in that single word, and writers gloss over the whole
subject when they say that.

Alloys are chosen or created with the intention to reliably fit
the function that engineers planned for in design. My guess is the
word alloy is used as representing a variety of alloys suitable
for a given design/application. Example: valves in a high
performance engine, be the valve stems hollow or solid, may be
made from 6-4 titanium (heat treated to 160KSI), while domed
piston heads may be made from 6061 aluminum; piston head pins may
be made from 7075 aluminum, assembled on connecting rods which may
be forged from 6-6 titanium (heat treated to 180KSI). Various
stainless steel and/or titanium parts may be made from sintered
stainless steel or titanium, where loads are low, below the limits
of sintered material yield. Then there's ceramics ...... (shrug)

I supposed you've already done an Internet search? I'll guess
again and say if you've done a search, you may have found alloys
having proprietary designations.
Until you said "7075," I didn't have a keyword to search for, but I
googled it last night, and now I've got the details. I would have
thought that it was alloyed with nickel, but it turns out to be
zinc.
Compared to steel, 20+ KSI yield stresses are pretty pathetic, but
I
guess that it's sufficient for the loads a component is likely to
experience in bicycling. I wonder who Campagnolo's suppliers are,
for that stuff, and who forges it.
Nickel is not a good alloying agent with aluminum.

Do you know why? :]

I can't recall the exact reason but I do recall meeting with
metallurgists working for Allegheny saying their macro's showed poor
grain structure. I don't know, perhaps never did know, the alloy blend
they tested. That was back in the early 60's when titanium sponge was
gaining popularity. The industrial titanium alloy widely was (and
perhaps still is) 6Al-4V titanium heat treated to 160Ksi -180Ksi
Ultimate, with 95Ksi min shear. 6Al-6V Titanium can be heat treated to
180Ksi min but its elasticity is lousy.

In this context, do Al & V stand for what I think they stand for?
.

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