Re: ANXIETY - New Charter Oak Machine
I found this read on Wikipedia interesting:
Alloying elements[edit]
The main alloying constituents are copper, manganese, and magnesium. A commonly used modern equivalent of this alloy type is AA2024, which contains 4.4% copper, 1.5% magnesium, 0.6% manganese and 93.5% aluminium by weight. Typical yield strength is 450 MPa (65 ksi), with variations depending on the composition and temper.[1]
History[edit]
Duralumin was developed by the German metallurgist Alfred Wilm at Dürener Metallwerke Aktien Gesellschaft.
In 1903, Wilm discovered that after quenching, an aluminium alloy containing 4% copper would slowly harden when left at room temperature for several days. Further improvements led to the introduction of duralumin in 1909.[2] The name is obsolete today, and mainly used in popular science to describe the Al-Cu alloy system, or '2000' series, as designated by the International Alloy Designation System (IADS) originally created in 1970 by the Aluminum Association.
I was thinking that most modern aircraft aluminum alloys are either 7075 or a 2000 series. 7075 is super strong, machines easily, and welds like crap. I don't know much about any of the 2000 series alloys as I have never used them.
Bob La Londe
http://www.YumaBassMan.com