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homework1 - homework#1(page 1 out of 2 1 Calculate the...

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MSE 3050, Phase Diagrams and Kinetics, Leonid Zhigilei homework #1 (page 1 out of 2) 1. Calculate the molar enthalpy of pure iron at 1500 K and one atmosphere pressure. The molar heats of phase transformations for iron are: Δ H α→γ = 670 J/mol; Δ H γ→δ = 840 J/mol; Δ H δ→ liquid = 13770 J/mol. The constant pressure heat capacities of different phases of pure iron are: c P α = 17.5 + 24.8 × 10 -3 T J/mol K c P γ = 35.5 J/mol K c P δ = 43.9 J/mol K c P liquid = 41.84 J/mol K Use the phase diagram to estimate the temperatures of phase transformations at 1 atm (or find an accurate value in a reference book) Plot schematically enthalpy vs temperature at one atmosphere pressure for pure iron in the temperature range from 298K to 1500K. In the plot show the values of temperatures of the phase transformations and the values of enthalpies at T = 298 K and T = 1500 K. γ -Fe α -Fe δ -Fe
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MSE 3050, Phase Diagrams and Kinetics, Leonid Zhigilei homework #1 (page 2 out of 2) 3. Calculate heat of formation of Al
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