1 picture- problem
2 other pictures- phase diagrams for problem
1. Draw a phase diagram for a binary eutectic alloy with solid solubility, naming and describing the significance of the main features. The binary alloy system of metals A and B contains two intermediate (intermetallic) phases A B and AB2 of narrow composition range, each of which forms by a peritectic reaction A cutectic point also exists, at 85at% B. The melting point of A is higher than that of B. and each metal can take a few per cent of the other into solid solution. (i) Sketch the phase diagram, and label the different phase fields. (ii) Describe the microstructures that you would expect to observe in solid alloys containing . 15at%B 40at% B 60ar%B in each case cooled slowly from the liquid state. 3. Describe the microstructural changes that occur when (i) Ag-10mol% Cu is cooled slowly from 750C to 500C, and (ii) Ag-20mol%Cu is cooled slowly from 1000C to 500C. In each case, calculate the final equilibrium amounts of the two solid phases. A liquid slag consists of 55mol% MnO and 45mol% Feo. Using the phase diagram provided, describe the solidification process that takes place when the slag is cooled to 1000’C. Calculate the equilibrium compositions, and the relative amounts of the phases present in the slag at 1000C. 5. Describe suitable compositions and heat treatments to manufacture the following microstructures: (i) 20wt% pearlite dispersed in a matrix of ferrite Gil) Swt% graphite dispersed in a matrix of pearlite. Ag-Cu phase diagram 1100 liquid temperature a) D 780_ LLL 3 20 80 98 40 mol % 60 Cu 1780 liquid T(C) 1430 65 40 85 – 1380 Mno 1000 35 mol 0/0 Feo 75 TC 1540 liquid 1150 1910 730 Felbze _ 4 3 wemac Fezc
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