HW+1+Discussions - HOMEWORK CHAPTER 1 Solutions* 1. Make a...

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HOMEWORK CHAPTER 1 1. Make a table comparing strength, ductility, electrical and thermal conductivities, thermal stability, and the typical applications for metals, ceramics and polymers. 2. Using sources such as the web, when did metals such as gold and silver; copper, brass and bronze; iron and steel; and aluminum alloys become materials that could be readily fabricated in parts and used by society? *The answers I provided are more complete than I expected from you but they should serve a guide for preparing for exam 1. Solutions*
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HOMEWORK CHAPTER 1 3. Describe the materials that are used on the surfaces of the space shuttle. What properties of these materials make them particularly useful for the space shuttle and why? What are the problems associated with these materials? 4. Plot the elastic modulus and the coefficient of thermal expansion versus the absolute melting temperature for solid elements. Is there a correlation between modulus and coefficient of thermal expansion?
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Characteristics of Metals Excellent conductors of heat and electricity Bonding is metallic Relatively strong Ductile Dense Formable Generally crystalline
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Correlation Between Strength and Ductility Strength Measure of Ductility General Trend
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Correlation Between Strength and Ductility Strength Measure of Ductility True improvement in performance
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Metallic Bond Ion cores of 2+ charge Delocalized cloud of valence electrons Schematic of metallic bonds in solid magnesium
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Metallic Bond Ion cores of 2+ charge Thermal motion e - Electron scattering leading to a reduction in conductivity
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Metallic Bond Ion cores of 2+ charge e - Vacancy Electron scattering leading to a reduction in conductivity
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Characteristics of Ceramics Composed of metallic and nonmetallic elements Bonding is a mixture of covalent and/or ionic Generally good insulators Good thermal stability and reactivity Intermediate density Tend to be brittle Crystalline and noncrystalline
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Characteristics of Polymers Long-chain molecules Covalent bonding and secondary bonding Low density Low strength Can be very ductile or very brittle Noncrystalline and some crystalline
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Period Mining Methods Tools Ores
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This note was uploaded on 09/12/2011 for the course MSE 2001 taught by Professor Tannebaum during the Fall '08 term at Georgia Institute of Technology.

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HW+1+Discussions - HOMEWORK CHAPTER 1 Solutions* 1. Make a...

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