HW2 Sol

HW2 Sol - UCLA MAE 183 HW#2 Solutions Fall 2010 Review Q...

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1 UCLA MAE 183 HW#2 Solutions – Fall 2010 Review Q 6.2: What are the two major groups of metals? Define them. Answer . Ferrous metals, which are based on iron; and nonferrous, which includes all others. Review Q 6.7: The copper-nickel system is a simple alloy system, as indicated by its phase diagram. Why is it so simple? Answer . The Cu-Ni alloy system is simple because it is a solid solution alloy throughout its entire composition range. Review Q 6.13: What is the predominant alloying element in all of the stainless steels? Answer . Chromium. Review Q 6.16: Identify some of the properties for which aluminum is noted. Answer . Aluminum is noted for its low density, high electrical and thermal conductivity, formability, good corrosion resistance due to the formation of a tough oxide film on its surface, and ability to be alloyed and strengthened to achieve good strength-to-weight ratios. Review Q 6.19: What elements are traditionally alloyed with copper to form (a) bronze and (b) brass? Answer . The elements are (a) tin and (b) zinc. Review Q Extra: Explain why aluminum, magnesium, and titanium are expensive when they are abundant on earth. Give a reason to recycle aluminum. Answer . They require tremendous amount of electricity for extraction from their natural state. Recycling aluminum saves energy and reduces the cost of aluminum. Multiple Choice Q 6.1: Which of the following properties or characteristics are inconsistent with the metals (two correct answers): (a) good thermal conductivity, (b) high strength, (c) high electrical resistivity, (d) high stiffness, or (e) ionic bonding? Answer . (c) and (e). Multiple Choice Q 6.2: Which one of the metallic elements is the most abundant on the earth: (a) aluminum, (b) copper, (c) iron, (d) magnesium, or (e) silicon? Answer
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HW2 Sol - UCLA MAE 183 HW#2 Solutions Fall 2010 Review Q...

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