a) Explain the mechanism of dislocation motions to induce strengthening in a material and explain the role of grain size. (10) marks) b) With the help of drawing, explain the benefit of having interstitial and substitutional atoms in increasing the strength of an alloy by describing the mechanism of interaction between solute atoms and dislocations. (10 marks) c) Show the steps to determine the following plane in Figure 3: (5 marks) 5 a) Explain the mechanism of dislocation motions to induce strengthening in a material and explain the role of grain size. (10) marks) b) With the help of drawing, explain the benefit of having interstitial and substitutional atoms in increasing the strength of an alloy by describing the mechanism of interaction between solute atoms and dislocations. (10 marks) c) Show the steps to determine the following plane in Figure 3: (5 marks) 5