[doo-ral-yuh-min, dyoo-] 
| an alloy of aluminum that is 4 percent copper and contains small amounts of magnesium, manganese, iron, and silicon: used for applications requiring lightness and strength, as in airplane construction. |
| du·ral·u·min (dŏŏ-rāl'yə-mĭn, dyŏŏ-) n. An alloy of aluminum that contains copper, manganese, magnesium, iron, and silicon and is resistant to corrosion by acids and sea water. [Originally a trademark.] |
duralumin
strong, hard, lightweight alloy of aluminum, widely used in aircraft construction, discovered and patented in 1910 by Alfred Wilm, a German metallurgist; it was originally made only at Duren in Germany. The original composition has been varied for particular applications; it may contain about 3 or 4 percent copper, 12 to 1 percent manganese, 12 to 1 12 percent magnesium, and, in some formulations, some silicon. After heat treatment and aging, these alloys are comparable to soft steel in strength
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