Explain the solidification of 50Pb-50Sn alloy
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- Describe a method by which “ODS” alloys are produced and explain why it is not possible to cast these alloys using conventional techniques.What can be determined when looking at the micostructure of this high manganease metal?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.
- Explain how grain boundaries are formed upon solidification of metals.What are the effects of alloving elements on Fe-C binary phase diagrami need the answer to this question please not the composition : Discuss the indicators of solidification initiation and termination and the implied alloy composition(s)
- Explain two important differences between martensitic and pearlitic transformations.Lead-Tin (Pb-Sn) alloys are used in soldering applications. Draw phase diagram and Distinguish between the micro-structure at composition of “Pb40%Sn” and “Pb80%Sn”.Sketch a phase diagram for two soluble components. Show the melting tem-perature of each element. Label all axes, curves, and zones.
- 23/. Differentiate Substitutional and Interstitial solid solutions with a neat diagram.Consider a Pb-35% Sn alloy. Determine: a) if the alloy is hypoeutectic or hypereutectic b) the composition of the first solid to form during solidification c) the amounts and compositions of each phase at 184 degrees C d) the amounts and compositions of each phase at 182 degrees C e) the amounts and compositions of each microconstituent at 182 degrees C f) the amounts and compositions of phase at 25 degrees CCalculate the number of vacancies per cm3 expected in copper at 1080°C (just below the melting temperature). The energy for vacancy formation is 20,000 cal/mol.