Question: (a) Name three classes of defects in crystals and give one example for each class you have named. (6 marks) (4marks) (b) Describe the

(a) Name three classes of defects in crystals and give one example for each class you have named. (6 marks)

(a) Name three classes of defects in crystals and give one example for each class you have named. (6 marks) (4marks) (b) Describe the following material properties of materials as used in industry (i) Hardness (i) Malleability (iii) Yield strength (iv) Tensile strength (c) A 20 mm diameter aluminium tensile test specimen has gauge length 80 mm. The load corresponding to its 0.2% proof stress is 40kN and the maximum load it can support is 75kN at length 96 mm. The modulus of elasticity of aluminium is 70 GN/m Calculate: (10 marks) (1) Yield strength. (1) The tensile strength. (i) (IS) The length of the specimen when supporting the 40kN load. The true stress at the start of non-uniform deformation

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