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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Hypereutictic aluminum alloy expansion coefficient
I've always been told that one of the cool things about hypereutectic
aluminum alloy is that its thermal expansion coefficient is significantly lower than plain ol' aluminum, which makes it a handy material for pistons. (The other cool thing being that all those silicon particles can make for a hard, low-wear surface if you machine it correctly). I was curious yesterday so I went prospecting on Matweb -- it listed pretty darn near the same expansion rates for 2024 and an alloy with 18% silicon. It also said the CTE was "derived from similar alloys on Matweb", which makes me wonder what they mean by "similar". So now I don't know what to believe. Anyone know a handy chart of aluminum alloys and their coefficients of thermal expansion? Google is not my friend in this: when I do a Google search all I get are enthusiastic articles by gearheads like me. I can learn all the stuff I already know about the virtues of the stuff, not any engineering data about those virtues. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com |
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