Question: 1. What is the difference between crystalline and noncrystalline structures in materials? 2. How do grain boundaries contribute to the strain hardening phenomenon in metals?

1. What is the difference between crystalline and noncrystalline structures in materials? 2. How do grain boundaries contribute to the strain hardening phenomenon in metals? 3. Identify some materials that have a crystalline structure. 4. Identify some materials that possess a noncrystalline structure. 5. What are some of the general properties that distinguish metals from ceramics and polymers? 6. What is an alloy? 7. What is the range of carbon percentages which defines an iron-carbon alloy as a steel? 8. Identify some of the properties for which aluminum is noted? 9. Describe one method to prevent the formation of martensite during welding. 10. For the copper-nickel phase diagram in the Figure, find the compositions of the liquid and solid phases for a nominal composition of 70%Ni and 30%Cu at 1371C(2500F). (Cu) Composition / wt \% Ni (Ni)
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