give a short note on buralumian
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Duralumin (also called duraluminum, duraluminium, duralum, dural(l)ium, or dural — a portmanteau of Durable and Aluminium) is a trade name for one of the earliest types of age-hardenable aluminium alloys.
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Duralumin is a strong, lightweight alloy of aluminium discovered in 1910 by Alfred Wilm, a German metallurgist. It is relatively soft, ductile and easily workable under normal temperature. The alloy can be rolled, forged and extruded into various forms and products. The tensile strength of duralumin is higher than aluminum, although its resistance to corrosion is poor. The electrical and heat conductivity of duralumin is less than that of pure aluminum and more than that of steel. It was initially used in rigid airship frames, and its heat-treatment methods and composition were wartime secret. With the introduction of new monocoque construction methods in early 1930s, duralumin was widely used in the aircraft industry.
The light weight and high strength of duralumin when compared to steel enabled its application in aircraft construction. However, a special laminated form of duralumin called alclad is used in the aircraft industry as it tends to lose strength during welding.