MTE2102 · Phase equilibria and phase transformations

Overview

This unit will focus on the microstructure of materials, considering how the stability of different phases of materials depends on basic thermodynamic functions. Phase diagrams and the key concepts of Gibbs energy and chemical potential are used to explain the equilibrium between phases and to predict the microstructures of materials. The mechanisms of new phase formation are discussed in terms of both the driving forces and kinetics of formation, including the role of atomic diffusion. What happens when the thermodynamically stable microstructural state cannot develop is discussed and metastable microstructures are considered in detail. Throughout the unit, technologically important materials systems are used to illustrate these concepts.

Areas of study: E3001 Bachelor of Engineering (Honours) - Specialisation: Materials engineering E6011 Master of Professional Engineering - Specialisation: Materials engineering

Offerings

Assessment

The Handbook lists an examination for this unit.

Continuous assessment: 50% Final assessment: 50% This unit contains threshold hurdle requirements that you must achieve to be able to pass the unit. You are required to achieve at least 45% in the total continuous assessment component and at least 45% in the final assessment component. The consequence of not achieving a hurdle requirement is a fail grade (NH) and a maximum mark of 45 for the unit.

Assessment details may change. Please refer to the assessment information in Moodle closer to the start of the teaching period.

Requisites

Learning outcomes

1. Describe the derivation of phase diagrams from the laws of thermodynamics, based on the concepts of Gibbs energy and chemical potentials.
2. Quantitatively describe equilibrium states using phase diagrams.
3. Use Gibbs energy curves and chemical potentials to describe the driving forces for diffusion and phase transformations.
4. Describe the microstructures to be expected for various material systems exhibiting, in particular complete solid solubility, eutectic, eutectoid and peritectic reactions.
5. Describe how atomic diffusion occurs in liquid and solid phases and how this controls the nucleation, growth and coarsening of phases.
6. Discuss the concept and applications of phase metastability.
7. Use basic laboratory skills to study the microstructure of materials, be able to work effectively within a team in carrying out laboratory work, be able to keep appropriate laboratory records and develop skills to communicate the results and conclusions of practical work.

Workload

The minimum total expected workload to achieve the learning outcomes for this unit is 144 hours per semester typically comprising a mixture of 3-6 hours of scheduled learning activities and 6-9 hours of independent study per week. Scheduled activities may include a combination of teacher-directed learning, peer-directed learning and online engagement. Independent study may include associated readings, assessment and preparation for scheduled activities.

Student experience, not official rules. Nothing here changes what the Handbook says.