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【资源】Alloys Preparation Properties Applications
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Alloys Preparation, Properties, Applications Edited by Fathi Habashi In general, the highly purified single crystal of a metal is soft and malleable. This may not be desirable and for this reason most metals are used in the fonn of alloys. The word “al- loy” is derived from the Latin alligae, mean- ing “to bind to”, which gave the French word “alliage”. An alloy is formed by combining a metal with other metals, nonmetals, or metal- loids. Alloys are used because they have spe- cific properties that are more attractive than those of the pure metals. For example, some alloys possess high strength, others have low melting temperatures, some are especially re- sistant to corrosion, and others have desirable magnetic, thermal, or electrical propeities. Brass is an alloy made with copper and zinc. Steel is an alloy made with iron and carbon, a nonmetal. Alloy steels are made by alloying steel with other metals; for example, stainless steel is a chromium-nickel steel. Ferrosilicon is an alloy of iron with silicon - a metalloid. Alloys with inercury are called amalgams. A few metals are, however, used in the pure fomi; copper for electrical puiyoses is pure metal while for construction purposes it is used in the form of an alloy. A pure metal usu- ally has high electrical conductivity, while the alloy is usually harder and niay have a much lower conductivity. >>>>>>>> http://d.namipan.com/d/9f9747761 ... 77f18f4cff175523a01 http://d.namipan.com/d/9f9747761 ... 77f18f4cff175523a01 http://d.namipan.com/d/9f9747761c45ca887fdf652d9b38177f18f4cff175523a01 |
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