Duralumin
Jack Cagna
Duralumin Composition
Duralumin is a strong, lightweight aluminum alloy consisting of aluminum, 0.5% manganese, 0.5% magnesium, and 4% copper. In some instances silicon is added.
Discovery of Duralumin
This alloy was discovered in Prussian Germany by Alfred Wilm, a metallurgist engineer. In 1903, Wilm was commissioned by the German War Munitions factory of Berlin to find a strong aluminum alloy that could be used for ammunition. After years of experimentation, in 1908, the alloy was ready to be released for commercial production.
Manufacture
The process in which Duralumin is manufactured involves a series of heat treatments. Before the heat treatment the alloy is malleable. The treatment induces a reaction between the aluminum and magnesium which increases overall strength and hardness.
Duralumin
Ductile
Before the heat treatment, duralumin can be easily manipulated into wire.
Lightweight
Duralumin is a very light alloy.
Tensile strength
After heat treatment, duralumin has increased tensile strength.
Resistant to Corrosion
Metallurgic bonding can increase corrosion resistance.
Oxidation
Reactions with surrounding oxygen can form aluminum oxide.
Heat treatment
Heating duralumin induces a reaction between the aluminum and the magnesium which increases hardness and strength.
Uses
Since duralumin is both strong and lightweight it is commonly used on aircrafts. It is also used to produce wire, rods, machinery, etc.
Sources
http://en.ccmotor.cn/UploadFile/myjhupfile/200882138384.gif
http://digitalcommons.mtech.edu/cgi/viewcontent.cgi?article=1038&context=bach_theses
http://www.researchgate.net/publication/45705177_Alfred_Wilm_and_the_beginnings_of_Duralumin
http://www.kmutt.ac.th/lpm/uploadz/news/53.pdf
http://digital.library.unt.edu/ark:/67531/metadc58745/m1/4/