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Unformatted text preview: 3. Callister, Question 6.49 4. For the data given below, draw a graph of yield strength versus d-1/2 . If Hall-Petch behavior holds, what is the average grain diameter if the yield strength is 310 MPa? Comment on why there is a grain size dependence of the yield strength. d [ μ m] Yield strength [MPa] 100 230 60 275 5. Callister, Question 8.20 (a) (b) and (d). Why should there be a fatigue limit? 6. Explain why a second hardness measurement made adjacent to a previous measurement indicates a higher hardness. 6. A TiO 2 crystal is grown with some Cr 2 O 3 impurities. The valence of Ti is +4, and the valence of Cr is +3. Chromium ions occupy titanium sites substitutionally. Explain what type of vacancy will be introduced. 7. (a) How does the internal stress state of Corelle dishware (as demonstrated in class) affect its mechanical properties? (b) What sort of behavior would you expect if the internal stress state were reversed?...
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- Spring '10
- Tensile strength, iron bar, Mechanical Behavior and Ceramics