Phase Diagrams Flashcards
What is a phase
The portion of a system that has uniform physical and chemical properties
What is a single phase system classed as
Homogenous
What is a 2 or more phase system called
Heterogenous
What is the solubility limit of a component in a phase
It’s the max amount of the component that can be dissolved in
Meta stable
Time to achieve equilibrium may be very long that a state along the path to the equilibrium may appear to be stable
Binary phase diagram
Define the stability of the phases that can occur in an alloy system at constant pressure
What is the liquidous line
Separates the liquid phase from the liquid and solid phase
What is the solidous line
Line that separates the solid phase from the liquid and solid phase
What is a eutectic system
The simplest system with two solid phases
The limit of solubility
What does the Solvus line show
Define the eutectic point
Where liquid and two solid phases co-exist in equilibrium
What is a eutectic reaction
Transition between liquid and mixture of two solid phases at eutectic concentration
What is the eutectic isotherm
The horizontal solidous line at Te
What is a hypoeutectic alloy
An alloy composition between that of the left hand side end of the tie line defining the eutectic reaction and the eutectic composition
Define the hyper eutectic alloy
An allow composition between that of the right hand side end of the tie line defining the eutectic reaction and the eutectic composition
