4. For iron-carbon alloy (steel), cite at least three characteristics that would improve with adding other alloying elem

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4 For Iron Carbon Alloy Steel Cite At Least Three Characteristics That Would Improve With Adding Other Alloying Elem 1 (85.57 KiB) Viewed 49 times

4. For iron-carbon alloy (steel), cite at least three characteristics that would improve with adding other alloying elements in amounts totaling less than 5%. 5. Why are bridges on road not made with plastics even today? 6. Mention four strengthening mechanisms of metals and alloys, and explain one of them. 7. Differentiate between thermoplastic and thermosetting polymers giving examples of both. 8. Why electrical resistivity of metals and alloys increases with degree of cold working? 9. Draw neat sketches to show each of the following: a. The two types of electron energy band structures for metals. b. The standard hydrogen electrode reference half-cell. 10. Explain briefly about semiconductor 11. Differentiate between intrinsic and extrinsic semiconductor 12. Explain why fibre reinforce composites used extensively? 13. State, with reasons, the group of materials in which the following belongs a. Reinforced cement concrete b. Plastic shopping bag c. Wood d. Brick e. Cast iron f. Rubber 14. Explain the following: (a) Strain hardening (b) Recrystallization and grain growth 15. What are semiconductors? Classify semiconductors, explaining their types 16. What is passivity of metals? Explain why the phenomenon of passivity of metals is important 17. Name methods for controlling corrosion 18. For the hypothetical phase diagram of element A and B below. Fill up the blanks Liquid L+ + a B 100% A % A/B 100% B