duralumin

A trade name for aluminum alloy containing copper, magnesium, and manganese. It has very high tensile strength and fatigue endurance. It is one of the most widely used alloys for construction of ribs, tanks, bulkheads, and propeller blades.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Duralumin

(also called duraluminum or dural), a collective name for a group of alloys based on aluminum and containing 3-5 percent copper, 0.4-2.4 percent magnesium, and 0.3-1.0 percent manganese. The Duralumin alloys were the first widely used deformable aluminum alloys. The phenomenon of hardening during natural aging was discovered with quenched duralumin.

The semicontinuous method is used to cast Duralumin into ingots, which undergo pressure treatment (rolling, pressing, and so on) to produce plates, sheets, sections, tubes, and wire for making rivets, forgings, and other intermediate products. Duralumin is quenched in water at a temperature of about 500°C and then undergoes natural aging for four days or, less frequently, artificial aging at about 190°C. After such heat treatment the ultimate strength of various grades of Duralumin is about 400-500 meganewtons per sq m (40-50 kilograms-force per sq mm). The initial period of development of metal airplane construction was associated with the manufacture of Duralumin. Along with aluminum alloys, Duralumin is widely used in aviation, surface transportation, and mechanical engineering.

REFERENCE

Bochvar, A. A. Metallovedenie, 5th ed. Moscow, 1956.

I. I. NOVIKOV

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References in periodicals archive

A product of Samsung Electronics America, a subsidiary of Samsung Electronics Corp., the 13.3-inch laptop is made of Duralumin, a durable type of aluminum alloy typically found in advanced aircrafts.

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Even during the worst phase of the recession in 1932, the Societe du Duralumin (an alloy manufacturing subsidiary of Pechiney) complained that it was not able to serve all orders because of its limited capacity.

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The numerical values of material properties used in the following illustrations correspond to those of duralumin. The density [[rho].sup.(1)] = 3000 kg/[m.sup.3], the linear coefficient of elasticity [[alpha].sup.(1)] = 100 GPa, and the linear wave velocity c = [([[alpha].sup.(1)]/[[rho].sup.(1).sub.0]).sup.1/2] [approximately equal to] 5773.5 m/s.

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The author proposes to manufacture it of duralumin, keeping to the dimensions shown in Figure 2.

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The Standard Steel Propeller Company of Pittsburgh, Pennsylvania, had begun producing forged duralumin propellers in the early 1920s and by 1927 was manufacturing all-metal, adjustable-pitch propellers for civilian and military use.

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Briefly, lower molar 1 or upper molar 2 was pulled from its socket, placed in a duralumin frame on a microscope slide, and measured to the nearest 0.05 mm under a stereomicroscope.

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The airport authority found nothing on the runway, but a check of the aircraft revealed that a round duralumin panel was missing from one of the aircraft's engines.

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