Re: What Is Alloy?
- From: Agent Smith <agent-smith@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 09 Apr 2008 11:38:20 GMT
nick c <nchen711@xxxxxxxxxxxxxxx> wrote in
IvXKj.17207$4O1.384@trnddc03:">news:IvXKj.17207$4O1.384@trnddc03:
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.
.
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