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  Text 1Materials differ widely in physical properties, machinability characteristics, methods of forming, and possible service lifeMechanical materials fall into two basic types: metallic or non-meta

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  Text 1Nonferrous metals and alloys cover a wide range of materials, frommon metals such as aluminum，copper, and magnesium to high-strength, high-temperature alloys, such as those of tungsten, ta

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  Text 1Low-melting alloys are so named because of their relatively low melting points The major metals in this category are lead, zinc, and tin and their alloys Lead(Pb) has properties of high densit

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  Text 1Metals are found everywhere in our life They are classified into two categories, “ferrous” and “non-ferrous” metals Ferrous means relating to, or containing iron and non-ferrous means having n