35 How To Read A Phase Diagram


In this phase diagram which is typical of most substances the solid lines represent the phase boundaries. This is the phase diagram for water.

Binary Eutectic Phase Diagrams

This phase diagram phase diagram shows a typical binary system that happens to contain a eutectic.

How to read a phase diagram. This is the most common form that you might see in your chemistry class or on some standardized test but what it captures is the different states of matter and when they transition according to temperature and pressure. At these temperatures and pressures the rate at which the solid sublimes to form a gas is equal to the rate at which. Visit our site for detailed mcat schedules course materials that accompany these lectures.

The phase fields of interest are the al θ and alθ phase fields on the left hand side. The liquid will change to a vapour it boils when it crosses the boundary line between the two areas. How to read a phase diagrams.

The points along the line connecting points a and b in the phase diagram in the figure above represent all combinations of temperature and pressure at which the solid is in equilibrium with the gas. So how do you read a phase diagram. Show you how to read and interpret simple phase diagrams describe the important iron carbon phase diagram and give examples of some more complex phase diagrams.

This is a fairly common characteristic of bimetallic alloys the copper silver system for instance has a phase diagram very similar to the one in the link. If it is temperature that you are varying you can easily read off the boiling temperature from the phase diagram. Introduce phase transformations and show how phase diagrams can be used to predict microstructure.

The green line marks the freezing point or transition from liquid to solid the blue line marks the boiling point or transition from liquid to gas and the red line shows the conditions under which a solid can be converted directly to a gas and vice versa. Let me write that down. First lets consider the information that is displayed.

Everybody remembers that the boiling point of water is 100c but thats only true at a certain pressure 1 bar. A phase diagram helps show what phase exist at what temperature and pressure. Boiling points melting points and sublimation points vary with pressure.

This lecture is part of series of lectures for the mcatforme home study program. This is indicated by the solvus line on the phase diagram. And there are many forms of phase diagrams.

In the diagram above it is the temperature where the red arrow crosses the boundary line. If you know everything already you can take this. For precipitation strengthening an al cu alloy this phase diagram indicates the minimum temperature to which an alloy must be heated to put all the copper in solution.

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