ME 306 Quiz Lecture 13

Materials Science

Phases represent a ________ portion of a system that has ________ physical and chemical properties.

homogeneous, uniform

Metastable states exist anywhere there is an energy ________ but not and energy ________ ________

minima, global minimum

When cooling from a liquid into a homogenous solid phase, the microstructure is ________.

homogeneous

Non-equilibrium microstructure formation results in regions of the nucleated phase having ________ concentrations of elements.

different

There is ________ nucleation of the liquid phase into the solid phase directly below the Eutectic point.

homogeneous

Equilibrium can exist anywhere on a phase diagram (T/F)?

True

Isomorphisms exist only when there are 3 phases (T/F)

False

Microstructures form by ____________________ growing over time.

Solid phase particles

A Eutectic solid phase can only be formed by cooling a liquid at the Eutectic point (T/F).

False

If I start from a solid phase, which phase will be present if I heat my sample to the Eutectic point?

Solid phase or Liquid phase

Derive an analytical representation for the weight percentage of the alpha phase, in terms of S and R.

Which phase, alpha or beta, will a lead atom most likely diffuse into?

Alpha