Phase Diagrams in Advanced Materials Engineering

These flashcards cover key terms and definitions related to phase diagrams and material transformations in Advanced Materials Engineering.

Phase Diagram

A graphical representation showing the phases present at different temperatures and compositions.

Eutectic Reaction

A reaction involving the transformation of a liquid into two solid phases at a specific composition and temperature.

Solidus Line

The line in a phase diagram above which a material is completely liquid.

Liquidus Line

The line in a phase diagram below which a material is completely solid.

Tie Line

A horizontal line in a phase diagram that connects the compositions of phases at equilibrium.

Gibbs Phase Rule

A rule that describes the relationship between the number of phases, components, and degrees of freedom in a system.

Hypoeutectoid Steel

Steel that contains less than the eutectoid composition of carbon, leading to a predominant phase of ferrite.

Hypereutectoid Steel

Steel that contains more than the eutectoid composition of carbon, which results in a predominant phase of cementite.

Pearlite

A microstructural feature consisting of alternating layers of ferrite and cementite.

Invariant Point

A point in a phase diagram where three phases coexist and is independent of temperature and composition.

Isomorphous System

A binary alloy system where complete solid solubility exists between the components.

Nucleation

The initial process of forming a new phase from a parent phase, which can be homogeneous or heterogeneous.