MIE 201 Practice Exam 2 from fall _08

MIE 201 Practice Exam 2 from fall _08 - Name _ MIE...

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Name _______________________________________ MIE Introduction to Materials, Fall ‘08 Exam #2 Answer all 5 Questions (Please keep your writing neat, use full sentences, and make the writing large enough so that it can be read.) Problem #1 a) Describe the difference between the substitutional and the interstitial mechanism for mass transport - diffusion in metals. b) Do these two mechanisms control mass transport – diffusion in 1) ceramics and 2) polymers? Explain your answers. c) Given the table of data below, which metal (iron - Fe, tungsten - W, or copper - Cu) has the highest self diffusion coefficient, D, at 950 o C. Explain your reasoning. Metal Melting Point ( o C) Crystal Structure σ y (MPa) K IC (MPam 1/2 ) Fe 1538 fcc 180 50 W 3410 bcc 522 80 Cu 1085 fcc 69 35
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Problem #2 a) Draw a typical true stress - strain curve, σ T vs ε T , for a metal. Indicate the yield point, and the point where necking takes place. b) Using this curve describe the process of strain hardening including the effect of
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This note was uploaded on 12/09/2010 for the course ME 201 taught by Professor Goldstein during the Fall '10 term at UMass (Amherst).

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MIE 201 Practice Exam 2 from fall _08 - Name _ MIE...

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