Duralumin, Its Properties and Uses Page: 19 of 22
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NI.A.O.A. Technical Memorandum Nyo. 284
18
copper, 20% zinc and 77- aluminum, or with duralumin wire. Rivets
marle from these alloys are better than those made from pure alumi-
num wire, since they have a greater shearing strength. After being
in use many months, they have shown no tears nor other defects.
Rivets made from cold-dravmn wire, composed of 31 Cu, 20% Zn
and 77 Al, and heated to 25000C (482F) have the greatest shearing
strength of 270 kg/cm (3840 lb./sq.in.), while values of 200-220 kg/
cm2 (2845-3129 lb./sq.in.) were obtained with rivets made from hot-
drawn duralumin wire. The first-mentioned rivets are preferable,
because they may be used at any length of time after the thermal
treatment and do not require retempering. puralumin rivets should
be used as quickly as possible after tempering and are comparatively
difficult to tighten. This difficulty may be remedied by employing
a somewhat softer alloy (2.25% Cu, 0.5 o Mg, 96.75 Al, 0.5% Mn)
which requires a thermal treatment similar to that required by dur-
alumin.
Translation by Dwight M". Miner,
National Advisory Committee
for Aeronautics.
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Beck, R. Duralumin, Its Properties and Uses, report, October 1924; (https://digital.library.unt.edu/ark:/67531/metadc58745/m1/19/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.