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Chapter 7 Review Vocab
Terms in this set (31)
the face-centered cubic (FCC) form of iron. The FCC phase in iron alloys is also referred to as this.
an iron carbide phase, Fe3C
a chemical substance (element or compound) used to specify the composition of an alloy.
the equilibrium melting reaction that occurs when a solid phase transforms to a liquid phase having identical composition.
Degrees of freedom
the number of independent variables necessary to specify equilibrium.
the transformation during cooling of a liquid phase isothermally and reversibly into two solid phases.
the transformation, during cooling, of a solid phase isothermally and reversibly into two new solid phases.
Gibbs phase rule
an equation that relates the number of phases present to the number of externally controllable variables.
a term that defines an alloy whose composition is greater than the eutectic composition.
a term that defines an alloy whose composition is greater than the eutectoid composition.
a term that defines an alloy whose composition is less than the eutectic composition.
a term that defines n alloy whose composition is less than the eutectoid composition.
the equilibrium melting reaction that occurs when a solid phase transforms into a solid and a liquid phase both having different compositions than the original solid.
a reaction is which there are zero degrees of freedom
a term used to describe a material with the same structure. When applied to a phase diagram, indicating that the solid phase has the same structure and hence complete solubility at every composition.
an expression that enables one to calculate the relative amounts of two phases present in a two-phase mixture in terms of the compositions of the alloy and the phases present
a compound whose composition is independent of temperature
the temperature at which a liquid begins to freeze during equilibrium cooling conditions.
the transformation, during cooling, of a liquid phase isothermally and reversibly into another liquid and a solid phase having different compositions from the initial liquid.
the transformation, during cooling, of a solid phase isothermally and reversibly into two solids having different compositions from the initial solid.
a two-phase microstructure of alternate ferrite and cementite lamellae occurring in some steels. Pearlite forms by the decomposition of austenite.
the transformation, during cooling, of a solid and a liquid phase isothermally and reversibly into a solid having a different composition from either the initial liquid or solid phase.
the transformation, during cooling, of two solid phases isothermally and reversibly into a solid having a different composition from either of the initial solids.
a homogeneous portion of matter bounded by a surface so that it is mechanically separate from any other portion.
a graphical representation showing the phase or phases present for a given composition as a function of temperature.
Primary solid phase
the first solid that appears upon cooling an alloy from the liquid phase.
the temperature at which a liquid phase disappears during equilibrium cooling conditions.
an atom or ion species that is dissolved in a host or solvent.
the phase boundary that separates single-phase solid regions from two-phase solid regions.
a temperature, pressure, and composition of a phase.
a horizontal line drawn on a phase diagram in a two-phase field connecting the composition of the two phases in equilibrium.
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