«Aluminum is very easily gives alloys with various metals. Among them is a technical use only alloy with copper. It is called aluminum bronze ... »
These words from the Mendeleev «Basic Chemistry» reflect the reality that existed in the early years 20century.
At the beginning of XX century the first family of alloys Dura was received. These alloys of aluminum with additions of copper and magnesium has been studied in 1903 ... 1911years by well-known German scientist A. Vilm. He discovered the phenomenon of aging, leading to a dramatic improvement in metal strength properties.
Dural after hardening (sharp cooling from 500 ° C to room temperature and maturing at this temperature for 4 ... 5 days), increases the strength and hardness. The ability of strain is not reduced, and the magnitude of strength increases from 6-8 to 36 ... 38 kg/mm2. This discovery has great significance for the development of the aluminum industry.

Magnesium in Aluminum Alloys

In aluminum alloying, magnesium is added for strength, stiffness and durability. It also improves the resistance of aluminum to corrosion, particularly in the manufacture of thin sheets. The amount of alloying varies between 1% and 10% depending on the specification and end use. These include the 5000 series containing 5.5% magnesium, the 7000 series ‘aerospace alloys' containing 3.5% and the 5141 alloy containing 1.1% magnesium.

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