Title: Summary Part Phase Diagrams 2

Choose the correct statement.

- A phase diagram maps the equilibrium phases of a material or alloy to specific conditions of temperature, pressure, and composition. (correct)
- A phase diagram maps the properties of a material or alloy to specific conditions of temperature, pressure, and composition.
- A phase diagram maps the equilibrium and non-equilibrium phases of a material or alloy to specific conditions of temperature, pressure, and composition.
- A phase diagram maps the equilibrium and non-equilibrium phases of a material or alloy to specific material properties.

- The development of microstructure during slow cooling of materials from the liquid state can be analyzed using phase diagrams. These "maps" identify the phases that are in equilibrium at given temperatures. (correct)
- The microstructure of materials stable at a given temperature and concentration is "mapped" in phase diagrams. Phase diagrams identify the phases that are always present in a material at a given temperature and concentration, independent of the previous processing history.

- For very similar components, complete solid solution can occur in the solid state as well as the liquid state. Such systems are described by a complete-solid-solution phase diagram. (correct)
- For very similar components, complete solid solution can occur in the solid state as well as the liquid state. Such systems are described by an eutectic phase diagram.

- An eutectic phase diagram is associated with limited solid solution. (correct)
- An eutectic phase diagram is associated with no solid solution.
- An eutectic phase diagram is associated with complete solid solution.

- An eutectic reaction produces a fine-grained, two-phase microstructure. The two phases in an eutectic microstructure might co-exist as lamellas, fibers or nodules. (correct)
- An eutectic reaction always produces a lamellar, two-phase microstructure.

- The fine-grained structure of the eutectic microstructure is the result of limited time available for diffusion: the segregation of A and B atoms into separate solid phases must be done on a small scale. (correct)
- The fine-grained structure of the eutectic microstructure is the result of limited temperature available for diffusion: the segregation of A and B atoms into separate solid phases must be done on a small scale.

- The lever rule in combination with the tie line can be used to identify the composition and the amount of each phase in a two-phase region of a phase diagram. (correct)
- The lever rule in combination with the tie line can only be used to identify the composition of each phase in a two-phase region of a phase diagram.
- The lever rule in combination with the tie line can only be used to calculate phase fraction and composition for solid-liquid two-phase regions.

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