ENG 2002 Lecture : eng__

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[6: define the atomic packing factor (apf). Calculate the apf for the face- centred cubic and the body-centred cubic crystal structures. [10: for a cubic system, write down the indices of the individual members of the <100> family of lattice directions and sketch them. [10: for a cubic crystal structure, sketch the (1 1 1), (2 3 4) and (3 2 1) planes. [12: determine which planes of the face-centred cubic structure have the highest density of atoms and calculate this value for copper (acu = Hint, the answer is in units of atoms/nm2. [12: [50, draw labelled diagrams to illustrate the four basic types of point defects in a crystal. [9: draw labelled diagrams to illustrate edge and screw dislocations in a crystal. [9: define the burgers vector and show them for the situations in (a) and (b) above (you can indicate them on the diagrams you drew above).

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