Driving Forces for Change

29/10/99


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Table of Contents

Driving Forces for Change

Factors controlling Phase Transformations

Driving force

Equilibrium

Energy of Systems

Free energy

Entropy

Entropy (cont.)

First Law of Thermodynamics

Thermodynamics (continued)

Thermodynamics (continued)

Driving force for solidification

Solidification (cont.)

Solid State Phase Changes

Other Process Driving Forces

Diffusion

Diffusion Mechanisms

Steady State Diffusion

Steady State Diffusion (cont.)

Fick’s 1st Law of Diffusion

Non Steady-state Diffusion

Non Steady-state Diffusion

Carburising

Carburising (cont.)

Carburising (cont.)

Carburising Example

Example (continued)

Factors Affecting Diffusion

Diffusion Distance

Nucleation

Nucleation (cont.)

Rate of Nucleation and Growth

TTT Curves

Author: Steve Bull

Email: s.j.bull@ncl.ac.uk

Home Page: http://www.staff.ncl.ac.uk/s.j.bull