Lever Rule Ternary Phase Diagram
Lever rule the lever rule is a rule used to determine the mole fraction x i or the mass fraction w i of each phase of a binary equilibrium phase diagram. It can be used to determine the fraction of liquid and solid phases for a given binary composition and temperature that is between the liquidus and solidus line.
At first sight the lever rule can appear confusing.
Lever rule ternary phase diagram. The lever rule if an alloy consists of more than one phase the amount of each phase present can be found by applying the lever rule to the phase diagram. The ratio of the two phases present can be found by using the lever rule. Now that we know the compositions of the two phases we need to find how much of each phase exists at the given temperature.
If at the given pressure and temperature the overall composition of the system z a is found within these values x a z a y a in the t x diagram or y a z a x a in the p x diagram the system will be in a two phase condition and the vapor fraction α g and liquid fraction α l can be determined by the lever rule. The simulation is available at. Ternary systems are those having three components.
Lever rule cannot be used here it can be assumed that moving closer to an spb line will likely increase the amount of the phase while moving closer. The composition of the alloy is represented by the fulcrum and the compositions of the two phases by the ends of a bar. This is for a single phase three component system.
It is not pos sible to describe the composition of a ternary alloy with a single number. The lever rule also applies to these phase diagrams. Uses a simulation to show how ternary phase diagrams are interpreted.
How to read ternary phase diagram. Ternary phase diagrams represent the phase behavior of mixtures containing three components in a triangular diagram. It is really invoking the conservation of mass and can be proved mathematically as shown below the diagram.
A brief overview of using a triangular phase diagram for a tertiary system acetone water mibkmade by faculty at the university of colorado boulder department of chemical and biological. Ternary phase diagrams wel e to brock determining position on ternary diagrams the position of each point in terms of the end member ponents can be read directly from the diagram reading a ternary diagram ternary plotting program power power point presentation animating how to read a ternary diagram and applying it to clastic rock classification and. Thus suppose a ternary mixture stream the composition of which is represented by point a on the phase diagram below left enters a settler below center which disengages the two equilibrium liquids from each other into streams b and c.
Phase diagrams are graphical representations of the liquid vapor and solid phases that co exist at various ranges of temperature and pressure within a reservoir.
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