2. [30 points] For each application below, determine if the particular choice of

Question

2. [30 points] For each application below, determine if the particular choice of metal or semiconductor (underlined) is appropriate or inappropriate, and explain your answer. If the metal is not suitable for the application, suggest a better choice (Callister Ch. 11). (a) The block of an internal combustion engine is made of magnesium alloy. (b) A showerhead ?s made of carbon steel. (c) Jet engine turbofan blades are made of zinc alloy. (d) Eyeglass frames are made of titanium. (e) An incandescent light bulb filament is made of aluminum. (f) Dental fillings are made of magnesium. (g) Computer chip interconnects conduct electricity through aluminum wires. (h) B-doped silicon is used to conduct electrons in a semiconductor device. (i) Sodium chloride is used as a semiconductor in solar cells. (j) A material that increases in conductivity as the temperature increases is copper.

Explanation / Answer

Magnesium alloy has a tendency to corrode, high temperature creep, and flammable. Use ceramics.

For light bulb filament, use tungsten.

Computer chip interconnection should use copper wires.

The others are appropriate.

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