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Solidification - Panos Tsakiropoulos

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Katrin Thomson

on 2 June 2011

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Transcript of Solidification - Panos Tsakiropoulos

Solidification of Alloys Professor Panayiotis (Panos) Tsakiropoulos Sir Robert Hadfield Building, F6
Ext. 25960 Solidification microstructures
and composition of phases Solute partitioning Solidification structures and
effect on properties Structure of
solid-liquid interface Eutectics Pure element Alloys Gibbs-Thomson undercooling Analysis of eutectic growth Analysis of dendritic growth Why? Reading
list Background knowledge Driving force for solidification Understanding solidification microstrucures Nucleation Homogeneous nucleation Heterogeneous nucleation Growth Phase selection Typical phase diagrams Effect of growth rate
on partition coefficient Effect of
convective mixing Solute
boundary layer Equilibrium lever rule Scheil analysis Phase transformation, from the liquid to
the solid phase, by cooling or crystallisation Energy cannot be created or destroyed
The entropy of the universe is continuously increasing
The entropy of all substances at absolute zero temperature is zero Key
Thermodynamic Concepts Internal, potential and kinetic energy Heat and Work Heat
capacity State functions: Gibbs free energy G
Entropy S
Enthalpy H Laws of Thermodynamics Solidification Equilibrium A system is at equilibrium when it is not changing with time and certain properties of the system are uniform throughout. In equilibrium the entropy has reached maximum value. Spontaneous change Non spontaneous processes have to be driven by doing work. In equilibrium the Gibbs free energy G has reached minimum possible value. Morphological stability - apply to the universe as a whole
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