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английский) 3:
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aluminum is a considerably new structural material. for a long period it was considered to be rather expensive since its production required the use of electric power. because of its relatively high cost, aluminum was not very popular as a construction material till the middle of the twentieth century. but now the situation is very different.aluminum and aluminum based alloys are extremely popular and are widely used in various forms for construction purposes.the advantages of aluminum, compared with other popular metals, are its high strength combined with lightness. high purity aluminum (about 99% pure) is soft and ductile but its great for us is that it is not strong enough. at the same time, it has high corrosion resistance and is used in construction of buildings as high foil for heat insulation, roofing, exterior and interior architectural ornamentation.and what about aluminum alloys? they are much more advantageous than pure substance, aluminum alloys are much harder and stronger than pure aluminum. besides, the pure aluminum is rather difficult to cast, and many of its alloys are extremely easily cast. pure aluminum is easily alloyed with other metals. and these combinations possess a great variety of usage. for example, when alloyed with copper, aluminum possesses additional strength. unfortunately, it is much less corrosion resistive than alloys with manganese, certain, or magnesium and silicon.one more advantage of aluminum is that it can be easily remelted over and over again.aluminum combined with on struggles forms a new oxide. its name is alumina. Alumina is a colourless crystallic substance. it is too hard, solid and extremely durable.it should be also noted that being an excellent conductor aluminum is widely used in power engineering. it serves for long distance transfer of electric power.
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