6. (a) What is meant by elastic deformation and plastic deformation of materials? Sketch a stress–strain curve to differ

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6. (a) What is meant by elastic deformation and plastic deformation of materials? Sketch a stress–strain curve to differ

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6. (a) What is meant by elastic deformation and plastic
deformation of materials? Sketch a stress–strain curve to
differentiate the deformation for ceramic, metal and polymer.
Describe your sketch for each material. (8 marks) (b) Briefly
describe the photon absorption mechanism in fluorescence,
luminescence and phosphorescence materials. (6 marks) (c) A
diffracted X-ray beam is observed from the (311) planes of
aluminium at a 2θ angle of 78.3o when X-ray of 0.1542 nm wavelength
are used. Calculate the lattice parameter of the aluminium. (6
marks)
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