## Phase Diagrams

### Course Name:

Phase Diagrams (MT252)

### Programme:

### Semester:

### Category:

### Credits (L-T-P):

### Course Outcomes:

CO1: To understand the microstructure of a given alloy under a given set of conditions

CO2: Correlation between microstructures and properties

CO3: Ability to use the concepts in subjects like heat treatment, phase transformations, etc.

### Course modules and teaching hours:

Module 1: (18 hours) Introduction: Types of solid solutions, Hume Rothery rules, Intermediate phases, Problems; Binary isomorphous system, phase rule and lever rule, Freezing behavior, coring, homogenization, examples, problems, thermal analysis; Miscibility gap, role of temperature; Eutectic systems, freezing, examples, problems, modifications, effect of cooling rate. Hypo and hypereutectics; Phase diagrams with intermediate compounds, line compounds, examples; Monotectics, examples, freezing, problems; Syntactic systems, freezing, examples, problems; Eutectoid systems, problems, effect of cooling rate, examples, hypo and hypereutectoids; Peritectic systems, examples, problems, equilibrium and realistic freezing, problems; Binary systems with multiple invariant points

Module 2: (24 hours) Ternary phase diagrams, isothermal sections and isopleths, ternary systems involving binary reactions, ternary reactions, experimental techniques of phase diagram determination, problems and examples

Module 3: (6 hours) Fe-Fe3C phase diagram, introduction to steels and cast irons, other commercially important binary systems