Question

Question C1. Give two (2) ways in which you can increase the yield strength of a metal and briefly explain how each works to increase the yield stress. Question C2. An aluminium-Silicon casting alloy has a composition that is close to the Al-Si eutectic composition. Give two reasons why this composition is used to cast aluminium based engine blocks Question C3. Describe briefly three (3) mechanisms by which short randomly aligned fibres add to the toughness of a composite. can Question C4. Differentiate between the terms 'hardness' and 'hardenability' and indicate how you would measure both of these properties of a steel. Question C5 Copper and Nickel form a solid solution across all compositions. Why is this so?

Answer 1

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ci) Methods to increase yield strength of metal DWork bardening or 'strain harde ning-In this case, the metal is subjected to a fluctuating local stresses. Thus causes the dislocations at microscopîc level ohich pTopogate to At normal temperatures, these dislocations a ccumulate and interact with each other and serve cause lattice TearTangement pinning joints or obstacles as that significantly impede their motion. This leads to increase in yield strength of materia at the expense of its ductility Solid solution strengthening:- It is a type of alloying to increase the yield strength of PuTe metal. In this method, atoms of an alloying elements are added to the baje met forming non-uniformity in the lattice due to alloying element and makes plastic deformation more difficcult by impeding dislocation motion. In other words. jt iorcreajei the yield strength of metals by increasirg its Tesi stance to deformation solid solution. This causes local