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MSE 360: Phase Transformation and Diffusion

MSE 360: Phase Transformation and Diffusion. Instructor: Yuntian Zhu Office: 308 RBII Ph: 513-0559 ytzhu@ncsu.edu Lecture 13. Solidification in Action. Alloy Solidification. T. T 1. Equilibrium Solidification (Fig. 4.20). X L. T 2. X S. T 3. T E. X E. X 0.

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MSE 360: Phase Transformation and Diffusion

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  1. MSE 360: Phase Transformation and Diffusion Instructor: Yuntian Zhu Office: 308 RBII Ph: 513-0559 ytzhu@ncsu.edu Lecture 13 1

  2. Solidification in Action 2

  3. Alloy Solidification T T1 Equilibrium Solidification (Fig. 4.20) XL T2 XS T3 TE XE X0

  4. Alloy SolidificationNo diffusion in Solid, Perfect Mixing in Liquid : Non-equilibrium level rule (Scheil Equation): XS = kX0(1-fs)k-1 XL = X0fLk-1 Eutectic reaction always happen in Fig. 4.21 4

  5. No Diffusion in Solid, Diffusional Mixing in Liquid T T1 XL T2 XS T3 TE XE D: Diffusivity, v = interface speed D/v = Characteristic width of concentration profile Fig. 4.22, X0

  6. Cellular and Dendritic Solidification T Constitutional Supercooling: Cell Structure: Dendritic structure: Condition for non-constitutional cooling: T1 XL T2 XS T3 TE XE X0

  7. Eutectic Solidification λ > λ* 7

  8. Off-Eutectic Solidification • Dendritic primary phase + eutectic structure (Fig. 4.37) 8

  9. Home Work • Reading assignment (to be quizzed at the next lecture): Ch. 4.4-4.7 • HW: 4.14, 4.15, 4.16, 4.18, 4.20. 4.21 9

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