Interactive phase diagram intro
If you click on a blue circle on this interactive phase diagram, it will show you a representation of the microstructure present at that composition and temperature.

To make things more interesting, see if you can use your knowledge of phase diagrams to predict the structure before you click on the circle. Were you right?

When you have finished, click on the quiz button above to test your understanding.
Interactive phase diagram 1a

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 1b

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 1c

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 1d

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 1e

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 1f

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 1g

At this temperature, the alloy is entirely liquid.
Interactive phase diagram 2a

At this temperature and composition, the microstructure consists of grains of pure alpha.
Interactive phase diagram 2b

At this temperature and composition, the microstructure consists of lumps of alpha solidifying from the liquid alloy.

The relative amounts of alpha and liquid can be estimated using the lever rule.
Interactive phase diagram 2c

At this temperature and composition, the microstructure consists of lumps of alpha solidifying from the liquid alloy.

The relative amounts of alpha and liquid can be estimated using the lever rule.
Interactive phase diagram 2d

At this temperature, an alloy of eutectic compostion is still liquid.
Interactive phase diagram 2e

At this temperature and composition, the microstructure consists of lumps of beta solidifying from the liquid alloy.

The relative amounts of beta and liquid can be estimated using the lever rule.
Interactive phase diagram 2f

At this temperature and composition, the microstructure consists of lumps of beta solidifying from the liquid alloy.

The relative amounts of beta and liquid can be estimated using the lever rule.
Interactive phase diagram 2g

At this temperature and composition, the microstructure consists of grains of pure beta.
Interactive phase diagram 3a

At this temperature and composition, the microstructure consists of grains of pure alpha.
Interactive phase diagram 3b

At this temperature and composition, the microstructure consists of grains of pure alpha embedded in solid grains ofthe eutectic mixture - alpha and beta that have a lamellar (stripy) structure.

The relative proportions of primary alpha and eutectic mixture can be estimated using the lever rule.
Interactive phase diagram 3c

At this temperature and composition, the microstructure consists of grains of pure alpha embedded in solid grains ofthe eutectic mixture - alpha and beta that have a lamellar (stripy) structure.

The relative proportions of primary alpha and eutectic mixture can be estimated using the lever rule.
Interactive phase diagram 3d

Because alloys of eutectic composition solidify at the eutectic temperature (i.e. not over a temperature range) the microstructure consists of a lamellar (stripy) structure of alpha and beta.
Interactive phase diagram 3e

At this temperature and composition, the microstructure consists of grains of pure beta embedded in solid grains ofthe eutectic mixture - alpha and beta that have a lamellar (stripy) structure.

The relative proportions of primary beta and eutectic mixture can be estimated using the lever rule.
Interactive phase diagram 3f

At this temperature and composition, the microstructure consists of grains of pure beta embedded in solid grains ofthe eutectic mixture - alpha and beta that have a lamellar (stripy) structure.

The relative proportions of primary beta and eutectic mixture can be estimated using the lever rule.
Interactive phase diagram 3g

At this temperature and composition, the microstructure consists of grains of pure beta.
Interactive phase diagram: quiz quiz1

Click the cicle on the phase diagram that corresponds to the microstructure shown.
Interactive phase diagram quiz2

Click the cicle on the phase diagram that corresponds to the microstructure shown.
Interactive phase diagram quiz3

Click the cicle on the phase diagram that corresponds to the microstructure shown.