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Q1. Explain in detail, the significance of the Pilling-Bedworth ratio as applied to the oxidation of metals. Titanium has a similar Pilling-Bedworth ratio to nickel and yet nickel alloys are chosen in preference to those based on titanium for use in high temperature applications such as gas turbines- why? If designing a jet engine, what other materials selection criteria might be important? Q2. What would happen to the microstructure and properties of a typical Al-Cu alloy, as used for precipitation hardening, when it is slowly cooled from its solution temperature? Q3. Explain what you understand by the term “oxygen concentration cell” and give some examples of where such cells might exist in an engineering context. In steel suggest how can such a cell give rise to “crevice corrosion” and give reasons why such a corrosion mechanism can be very problematic. How can such cells be avoided in practice? Q4. Briefly explain why stainless steel usually exhibits a far better corrosion resistance than conventional low carbon steels. What is the accepted minimum content of chromium to ensure corrosion resistance? What must be present in the environment in order to ensure corrosion resistance? Does stainless steel ever corrode? Q5. Explain what the benefits are of superalloy single crystal turbine blades in terms of reducing creep defomation. How are they made? List some of the other methods used by engineers and metallurgists to tackle creep in these components. Q6. Show how TTT diagrams can be created from a set of S curves obtained by monitoring a transformation. Are TTT diagrams limited to steels? Q7. Aluminium alloys do not exhibit a fatigue limit. Explain what this is and how, if engineering components are made out of steel, designs could enjoy a much longer fatigue life. Has this impacted on the selection of aluminium for engineering applications? Q8. Describe various

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