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ID: 836680 • Letter: N
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need help with this assignment
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Explain the differentiating criterion between high and low angle gram boundaries. What is the necessary condition for equilibrium between different phases? Explain using free energy curves of the phases. Why melting occurs at equilibrium melting temperature whereas solidification requires certain amount of undercooling? Why martensite plates acquire typical lens like morphology? Explain why. alloying elements have a much greater effect on the kinetics of a diffusional transformation when compared with the corresponding effect on displacive transformations. Show that the chemical potential of A and B can be obtained by extrapolating tangent to the G-X curve to XA = 0 and XB = 0. (dG = mu A dn A + mu B dn B and G = mu A XA + mu B XB ) The specific heat of solid copper above 300 K is given by Cp = 22.64 + 6.28 Times 10-3 T Jmol-K-1 By how much does the entropy of copper increase on heating from 600 to 1200K? The solid solubility of silicon in aluminium is 1.25 atomic% at 550 degree C and 0.46 atomic% at 450 degree C. What solubility would you expect at 200 degree C? Show passage of Shockley partial dislocations between every other (111) plane will transform an fcc in to hcp crystal structure. A recrystallized, dislocation-free gram is growing into a deformed matrix containing a dislocation density of 10 16 m-2 (10 16 m/m3). If the dislocations have energy of mu b:/4 J m-1, calculate the pulling force on the recrystallized gram boundary. (Assume shear modulus mu = 10 10 N m-2 and Burgers vector b = 0.28 nm). Explain the structure and energies of coherent, semicoherent and incoherent interfaces, with particular reference to the role of orientation relationships and misfit.Explanation / Answer
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