If you took two identical aluminum alloy castings and then had one cold worked (rolled, ect.) the cold worked sample would be much stronger and less ductile. It would also be less thermally conductive, but not by much, due to the huge increase in dislocations which are simply microstructure defects.
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>From: John Rodgers <jh_rodgers@BELLSOUTH.NET> >Reply-To: John Rodgers <jh_rodgers@BELLSOUTH.NET> >To: vanagon@GERRY.VANAGON.COM >Subject: Curious Question (NVC) >Date: Tue, 29 Jun 2004 14:43:17 -0500 > >I'm not an engineer, but have a question. > >Cast aluminum has a granular crystal quality in it's structure. >Milled >Aluminum (hammered, rolled) does not. > >Of two identical parts, one a machnined aluminum casting, and the >other >machined in milled aluminum, which would most likely have the best >1) >strength 2) heat transfer properties. > >Inquiring minds would like to know! > >Anybody?? > >Thanks, > >John Rodgers >88 GL Driver _________________________________________________________________ Make the most of your family vacation with tips from the MSN Family Travel Guide! http://dollar.msn.com |
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