Solid to Solid Phase Transformations (3) Mechanisms and rate-determining factors in solid-phase reactions in metals; diffusion processes, nucleation theory, precipitations from solid solution, eutectoid decomposition and order-disorder phenomena.
MATSE 562 Solid to Solid Phase Transformations (3)
This is the fundamental science of microstructural control in the solid state for inorganic materials. The course begins with a review of the crystallography of solid materials, from the simple concept of a lattice through the description of the stereographic projection to the point group notation.
Solid to solid nucleation theory is examined in detail as it forms the basis of microstructural development and control. Both "civilian" and "military" transformations are considered.
The theory of interface structure, the influence of orientation relationships, and the development of equilibrium precipitate morphologies are discussed in detail. It is argued that both thermodynamic and kinetic considerations may, however, dictate precipitate shapes. The kinetics of precipitate growth and coarsening are derived from first principles and employed to analysis overall transformation kinetics. Changes in precipitate shape during these kinetically driven processes are also examined.
The phenomena of nucleation, growth, and coarsening are all modified, and/or even controlled, by defects such as dislocations and grain boundaries. The course reviews dislocation theory and, e.g., the 0-lattice description of high angle grain boundaries and interphase interfaces.
A series of prototypical phase transformations are described in detail. These include: homogeneous and heterogeneous precipitation reactions; spinodal decomposition; order-disorder transformations, discontinuous precipitation, the eutectoid reaction, bainite and martensite.
Finally, experimental methods for the quantitative characterization of microstructure are presented.
Note : Class size, frequency of offering, and evaluation methods will vary by location and instructor. For these details check the specific course syllabus.