For a lead-tin alloy of composition 80 wt% Sn-20 wt% Pb and at 180 °C, do the following: (a) Determine the mass fractions of the α and β phases. (b) Determine the mass fractions of primary β and eutectic microconstituents. (c) Determine the mass fraction of eutectic β

An FCC iron–carbon alloy initially containing 0.25wt% C is carburized at an elevated temperature and in an atmosphere wherein thesurface carbon concentration is maintained at 1.0 wt%. If after 55.0 h the concentrationof carbon is 0.35 wt% at a position 5.0 mm below the surface, determine thetemperature at which the treatment was carried out.

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An alloy consisting of completely soluble cadmium (Cd) and zinc (Zn) in the liquid state, but neither of them dissolves in each other in the solid state. the table shown below shows the solidification temperatures for various alloys of cadmium and zinc. 1. Draw the equilibrium diagram according to the information given and data in the table and indicating all important temperature and phases. 2. Find the percentage of each phases and percentage of constituents of the alloy that contain 60 % Zn and at a temperature 300 °C. 3. Find the melting point for the following alloys 20 % Cd, 80% Cd 4. Draw the internal structure, noting the phases of the following alloys A) 30 % Cd at 290 °C b) 60 % Cd at room temperature. % of Zinc in alloy Start of solidification ("C) End of solidification ("C) 0 10 14 20 30 40 50 60 321 290 266 275 293 310 328 345 70 80 90 100 362 390 401 419 266 266 266 266 266 266 266 266 266 266 266 266

Silicon having a melting point of 1412°C forms an alloy with aluminum having a melting point of 660°C. The solidification temperature of the alloy is observed to be at 580°C at which the mass fraction of silicon is 0.125 Represent the liquid-solid diagram from the given data. Determine the phases present in the following conditions

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Engineering Metallurgy

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Calculate the amounts and compositions of phases at 726oC in a Fe-0.6% C alloy cooled under equilibrium conditions. Disregard the amounts of proeutectoid phases.       A.  77.3% α, 22.7% Fe3C; C in α = 6.7% and C in Fe3C = 0.02% B.  91.3% α, 8.7% Fe3C; C in α = 0.02% and C in Fe3C = 6.7% C.  77.3% α, 22.7% Fe3C; C in α = 0.02% and C in Fe3C = 6.7% D.  91.3% α, 8.7% Fe3C; C in α = 0.05% and C in Fe3C = 8.4% E. None of the mentioned