Duralumin Page: 2 of 14
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DURAL UM IN
By E. Unger and E. Schmidt.
Translated from Technische Berichte Vol. III - Section 6.
The use of duralxtin in the construction of aircraft makes
an account of the properties of this material desirable especially
with reference to its working qualities as developed by experience.
Composition, Specffc Gravity and MeltinW Point.
Duralu in is made in various compositions arn has, with the
exception of small quantities of impurities, the following composition:
Aluminnn 95.5 to 93.2 percent
Magne sim n5
Copper 3.5 " 5.5 "
Manganese .5 " .8 "
Lead, tin and zinc which, as is well known, have an unfavor-
able influence upon the permanence of aluminumn alloys, are not found
in duralumin.
The specific gravity of duralumin varies according to com-
position and hardness from 2.75 to 2.84. The melting point is about
6500 C.
Duraltnin is made under this name by the Durener Metallwerke,
Duren (Rhld), and under the name of Bergmetall by Carl Berg, Eveking
(Wstf.).
Working of Duralumnin
Like other metals, duralumin can be rolled into plates an&
shapes and behaves in a similar manner, in that the elongation de-
creases as the hardness of rolling increases. Tube blanks, however,
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Unger, E. & Schmidt, E. Duralumin, report, July 1920; (https://digital.library.unt.edu/ark:/67531/metadc53690/m1/2/: accessed April 22, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.