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 dislocations. Describe the strain hardening relationship, σ T = K ( ε T ) n , where K and n are constants.
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  • Spring '10
  • Materials Science, fcc bcc fcc, strain hardening relationship

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