(1) Aluminium alloys can be made stronger through heat- treatment or cold workin
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(1) Aluminium alloys can be made stronger through heat- treatment or cold working. Critically discuss the properties of these alloys that make them suitable for applications in many sectors, such as aerospace industry, automotive industry etc. [8marks] (2) Two aluminum alloy samples consisting of 4wt% copper were heated and soaked at 550°C. The first sample was cooled slowly from 550°C to room temperature. The yield strength of the slowly cooled sample was 130 MPa. The second sample was quenched into cold water from 550°C and was then aged at 150°C for 100h (peak value of the strength can be obtained). The yield strength of the quenched-and- aged sample was 450MPa. Explain the difference in yield strength, sketch the processes if needed. (both yield strengths were measured at 20°C) [12marks] (3) A batch of 2000 series aluminium alloy rivets for an aircraft wing was inadvertently overaged. What steps can be taken to reclaim this batch of rivets? [5marks] a1% Cu oC 20 50 60 70 80 90 100 L. 700 32.7 500 A 10 20 30 40 50 60 70 Cu wt% CuExplanation / Answer
Aluminum alloys are the best material to use when manufacturing airplanes because of its unique properties. It’s strong, lightweight, predictable and inexpensive.Its strength is similar to that of many types of steel, and it has good machinability and fatigue strength properties. The aluminium alloy has good mechanical properties and is easily welded There are a number of different types of aluminum, but some are more suited to the aerospace industry than others. Examples of such aluminum include, Aluminum 2024,Aluminum 3003, Aluminum 5052, Aluminum 6061,Aluminum 7075 etc.
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