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Microstructure and PropertiesCourse ContentCheating PolicyJeopardy 1Jeopardy 2Jeopardy 3Jeopardy 4Jeopardy 5Jeopardy 6Jeopardy 727-301 web siteHomework, Test ReviewHomework, Test Review, contd.Homework 4 Review, contd.Homework 3 Review27-301 Labs301 Lab 2 GradingTest, Exams, Grading PolicyCalendar: 301Exam RulesMid-course evaluations301 Final Exam Rules301 Final Exam: topicsMicrostructure and PropertiesMSE 27-301Fall, 2002 (1st mini-course)Prof. A. D. Rolletthttp://neon.mems.cmu.eduCourse Content•27-301 is the first of a pair of (mini-)courses that describe the relationship between materials microstructure and properties.•27-301 deals mainly with single phase microstructures: the companion course, 27-302, deals with multi-phase microstructures.•Technological materials (except Si-based) are multi-phase.Cheating Policy•Students are referred to the University Policy About Cheating and Plagiarism (Organization Announcement No. 297, 6116/80). It shall be the policy in this course to discourage cheating to the extent possible, rather than to try to trap and to punish. On the other hand, in fairness to all concerned, cheating and plagiarism will be treated severely.•Cheating includes but is not necessarily limited to:– 1.Plagiarism, explained below.– 2.Submission of work that is not the student's own for reports or quizzes.– 3.Submission or use of falsified data.•Plagiarism includes (but is not limited to) failure to indicate the source with quotation marks or footnotes, where appropriate, if any of the following are reproduced in the work submitted by a student:– 1.A graph or table of data.– 2. Specific language.– 3.Exact wording taken from the work, published or unpublished, of another person."Jeopardy 11. A domain wallA1. What is the boundary between two regions whose magnetization lies in different directions?2. Discontinuous transformationA2. What type of transformation is recrystallization an example of?3. Continuous transformationA3. What type of transformation is grain growth an example of?4. Has low mobility because it iscomposed of dislocations.A4. Why is a low angle GB difficult to move?5. Nabarro-Herring CreepA5. What type of deformation is controlled by diffusion in the bulk?6. Lamellar microstructureA6. What type of microstructure does a eutectoid reaction often give rise to?Jeopardy 21. 4th rank tensorA1. What kind of property is anisotropic elasticity?2. Temperature divided by melting pointA2. What does homologous temperature mean?3. Tangling and storage of dislocationsA3. What causes work hardening?4. Use the dot product.A4. How can we determine the direction cosine between two vectors?5. Close packed directionA5. How can we identify the direction of slip in a crystal (Burgers vector)?6. Critical resolved shear stressA6. What controls the onset of plastic flow (dislocation glide)?Jeopardy 31. Magnetization is parallel to <100>A1. To what directions does magnetoxtalline anisotropy limit magnetization in domains in Fe?2. Orowan bowing stressA2. What do we call the stress required to force a dislocation past a set of hard obstacles?3. Small enough fibers (whiskers) can be dislocation freeA3. Why do very thin metal wires/whiskers exhibit very high strengths?4. The maximum flaw (crack) size is limited by the fiber size.A4. Why does the strength of glass fibers increase as the diameter goes down?5. A balance between energy required to create new crack surface and elastic energy released.A5. What energies do we examine in order to derive the Griffith equation?6. E/2πA6. What is an estimate of the theoretical cohesive strength of a crystalline solid?Jeopardy 41. Who is the funniest professor in MSE?Q1. I’m not going to say!2. Controlled by diffusion alonggrain boundaries.Q2. What is the mechanism for Coble creep?3. Size increases as the yield stress goes down.Q3. How does the plastic zone size depend on yield stress?4. E100 and E111.Q4. In cubic materials, which pair of directions exhibit the largest and smallest modulus?5. Cleavage fracture.Q5. What type of fracture leads to flat fracture surfaces, often crystallographic?6. Cup and cone.Q6. What is the term often used to describe ductile fracture in a tensile test?Jeopardy 51. Leak before breakQ1. What is the design philosophy often applied to pressure vessels?2. Which professor is the best tennis player in the dept?Q2. Fruehan3. Micro-crackingQ3. Which toughening mechanism in ceramics relies on a weak second phase?4. It works by dispersing a metastable second phase through the material that transforms in the vicinity of a crack tip.Q4. How does transformation toughening work?5. Flat, crystallographic surfaces with “river lines.”Q5. What fracture morphology do you associate with brittle fracture (in metals)?6. Too large particles will transform on cooling, before any stress is applied to them.Q6. Why is there a critical size for particles for transformation toughening?Jeopardy 61. Each phase experiences the same strainQ1. What does isostress mean in estimating the modulus of a composite?Q2. What was originally housed in the clean room in Hamerschlag basement?2. A coal-fired power plant3. The modulus is the arithmetic mean of the component moduli.Q3. What average does the isostrain model lead to for composite modulus?4. Upper bound in strength.Q4. What do we call the limit that specifies the maximum value of a property?5. High modulus and simple lattice.Q5. What properties of non-metallic materials are associated with high thermal conductivity?6. Ductile-to-Brittle-Transition-Temperature.Q6. What is the temperature at below which many materials become brittle?Jeopardy 71. Diamond>AlN>SiCQ1. Name three adamantine compounds that are excellent thermal conductors and their ranking?2. Where is the least politically correct inscription on a CMU building?Q2. On Margaret Morrison!3. Hill average Q3. Whose name is associated with the average of the isostress and isostrain models?4. Rule of Mixtures.Q4. What rule can we apply as a first approximation to composite properties?5. Reuss, VoigtQ5. What names are associated with the isostress and isostrain assumptions for composite modulus?6. K = C v l.Q6. What is the basic equation for thermal conductivity?27-301 web site•Go to neon.mems.cmu.edu•Click on Faculty•Click on Rollett•Click on Educational


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CMU MSE 27301 - Microstructure and Properties

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