(a) Explain the difference between allotropy and polymorphism. Give a few examples of allotropes for carbon....

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(a) Explain the difference between allotropy and polymorphism. Give a few examples of allotropes for carbon. (4 marks) (b) Dislocations in metals have a significant importance in materials science. Explain what are dislocations, draw a simple example to illustrate your answer. (5 marks) (c) What implications do dislocations have on the properties of a metal? (4 marks) (d) Sketch the typical stress-strain behavior of a ductile material upon tensile testing labelling the important zones. How would the stress-strain curve of a brittle material differ from that of a ductile material? (6 marks) (e) Differentiate between fatigue testing and impact testing. What does each simulate in the service life of an engineering component? (4 marks) (f) What does a material's hardness represent in terms of the material's properties? (2 marks) (a) Explain the difference between allotropy and polymorphism. Give a few examples of allotropes for carbon. (4 marks) (b) Dislocations in metals have a significant importance in materials science. Explain what are dislocations, draw a simple example to illustrate your answer. (5 marks) (c) What implications do dislocations have on the properties of a metal? (4 marks) (d) Sketch the typical stress-strain behavior of a ductile material upon tensile testing labelling the important zones. How would the stress-strain curve of a brittle material differ from that of a ductile material? (6 marks) (e) Differentiate between fatigue testing and impact testing. What does each simulate in the service life of an engineering component? (4 marks) (f) What does a material's hardness represent in terms of the material's properties? (2 marks)

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Answer Qa Points of difference between polymorphism and allotropy Polymorphism is the presence of several different forms of the same solid material It means that the compounds of this type may have m... View the full answer