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@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?

Al = Aluminum

V = Vanadium

I thought that titanium alloys were steels.
.

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