The module will build on the description of phase diagrams, bonding and diffusion from level C to introduce time dependence and the factors controlling driving forces in metallic and non-metallic systems. Aspects of processing will be introduced as well as solid state thermodynamics and kinetics for nucleation and growth (diffusional) leading to JMAK, reconstructive, displacive and mixed transformations using steel and ceramic examples, TTT and CCT diagrams.
These link to the requirements in the QAA Materials benchmark statement of 2017, in particular: 3.4.ii phase equilibria and phase transformations multiphase materials, thermodynamic and kinetic aspects; 3.4.iii structure on the nano, micro, meso and macro scales; 3.4.xi materials design compositional variation and processing to achieve required microstructures, and hence properties.
Learning Outcomes
By the end of the module students should be able to:
Read complex binary and ternary phase diagrams to predict the phases, compositions and microstructures observed in materials [C2, C5, C12];
Use concepts of thermodynamics to explain equilibrium binary and ternary phase diagrams [C1];
Describe all factors contributing to Gibbs free energy in multi-component systems, and use simple thermodynamic models to carry out calculations and predictions [C1, C2];
Use concepts of thermodynamics and diffusion to explain the occurrence of solid-state phase transformations in metallic and non-metallic materials [C1];
Use accepted diagrams, standards and mathematical models to predict the extent of transformations in different systems [C2, C5,C12,C14];
Use solutions to Fick’s second law to predict concentration profiles given a set of boundary conditions [C1, C2];
Describe the fundamental processes occurring during reconstructive, displacive and mixed transformations [C1];
Suggest appropriate processing methods to control grain size and precipitation in a variety of systems [C5,C13,C14];
Use mathematical models to predict the evolution of microstructure [C1].
