For the solidification of nickel, calculate the critical radius r* and the activation energy ΔG* if nucleation is homogeneous. Values for the latent heat of fusion and surface free energy are -2.53×109 J/m3 and 0.255 J/m2, respectively. The supercooling value ΔT for the homogeneous nucleation of Ni is 319 oC. The melting point for Ni is 1455 oC.

Q: Calculate the number of vacancies per cubic meter for some metal, M, at 806°C. The energy for…

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Q: Why are Ni3Al (γ') precipitates particularly effective at strengthening nickel-based superalloys?

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Q: 1044 Determine the liquidus temperature, soli- dus temperature, and freezing range for the following…

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Q: Calculate the energy for vacancy formation in silver,

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A: Consider the phase diagram of an isomorphous alloy as shown.

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Q: 5

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Q: (a) Why is the carbon concentration in austenite (y-Fe) higher than in ferrite (a-Fe)? (b) Determine…

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Q: Cite the phases that are present and the phase compositions for the following alloys: 15 wt% Sn–85…

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Q: Explain the following microstructures: -Lamellar  -Bimodal -Equiaxed

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Solidification of metals

The term solidification indicates the conversion of material from the state of liquid to the state of solid. The solid-state is more compact and rigid than liquid, and the solidification indicates the transformation of material from a random state to a more compact and crystalline form. The point at which dendrite formation in liquid starts taking place is referred to as the solidification point.