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Consider an Al-4.5% Cu alloy. Note that for the Al-Cu phase diagram TE=548C; max. solid solubility is at 5.65%Cu; and the eutectic composition is at 33%Cu. Temp of Al is 660C. Using the Scheil Equation:

a) Determine the composition of initial solid formed.

b) Determine the composition of the last liquid that solidified

c) What is the total volume of eutectic formed during non-equilibrium solidification of such a 4.5% Cu alloy? d) What are the assumptions made in the Scheil Equation?

image text in transcribedimage text in transcribed

(a) AVERAGE COOLING RATE (C/min) (b) Avogadro's number =6.0231023 atoms per mole Boltzmann constant =1.3801023m2kgs2K1 Universal Gas constant =8.314JK1mol1 For aluminum: Density =2.702gcm3 Atomic weight =26.982gmol1 Atomic volume =9.98cm3mol1 Heat of fusion =10.790kJmol1 Specific heat capacity: 0.90Jg1K1 Lattice parameter =0.405nm GTmLT Sm=TmL ulliver- Scheil Equaxin CskC0(1fs)k1CL=C0fL(k1)

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