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MAE 20 final study guide_summer_2010

MAE 20 final study guide_summer_2010 - 9 Phase...

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MAE 20, Elements of Materials Science (Summer, 2010) Final Exam Study Guide 1. Miller indices for directions and planes in a cubic system: their use in slip systems of fcc and bcc unit cells. Slip as a basis for mechanical deformation. 2. Defects in crystals: vacancies and dislocations (edge vs. screw) 3. Fick’s laws of diffusion. Diffusion in metals and polymers. 4. Features of the Engineering and True Stress-Strain curves. 5. The effect of cracks on mechanical failure in a material. The concept of Stress concentration (and Stress concentration factor) near inhomogeneities 6. Ductile vs. Brittle failure. The concept of the resolved shear stress 7. Fatigue and creep failure: Definition, characteristics, and differences. 8. Elements of binary phase equilibrium diagrams . Definitions of components, phases, eutectics, eutectoids, peritectics, liquidus, and solidus lines. Lever rule. The Fe-C phase diagram as the basis for different types of steels and cast-irons.
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Unformatted text preview: 9. Phase transformations for making steels: The concept of the TTT diagram, e.g., Why is there a “nose”? How are cooling rates controlled to produce coarse and fine pearlite/bainite and martensite? Applications of low, medium, and high-carbon steels and cast irons. (at least 2 of each) Alloyed steels, e.g., stainless steel 10 . Polymer materials : Structure : Describe the structure of a typical polymer ( e.g., polyethylene), Thermoplastic polymers vs. Thermoset polymers. What is a copolymer? Mechanical properties : Stress- strain behavior of a polymer and a plastic (contrast with stress-strain curves of ceramics and metals). Non-crystalline solids and glasses – distinction from crystalline solids. The notion of glass transition temperature and viscosity. Variation of Elastic/Relaxation modulus with temperature. Viscoelasticity and examples of a rubber/elastomer....
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