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31 Cards in this Set
- Front
- Back
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austenite
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The face-centered cubic (FCC) form of iron
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cementite
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An iron carbide phase, Fe3C
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component
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A chemical substance (element or compound) used to specify the composition of an alloy
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congruent melting
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The equilibrium melting reaction that occurs when a solid phase transforms to a liquid phase having identical composition
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degrees of freedom
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The number of independent variables necessary to specify equilibrium.
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eutectic reaction
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The transformation during cooling of a liquid phase isothermally and reversibly into two solid phases
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eutectoid reaction
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The transformation, during cooling, of a solid phase is()thermally and reversibly into two new solid phases
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Gibbs phase rule
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For a system at equilibrium, an equation that relates the number of phases present to the number of externally controllable variables.
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hypereutectic
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An alloy whose composition is greater than the eutectic composition
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hypereutectoid
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An alloy whose composition is greater than the eutectoid composition
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hypoeutectic
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An alloy whose composition is less than the eutectic composition
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hypoeutectoid alloy
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An alloy whose composition is less than the eutectoid composition
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incongruent melting
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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.
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invariant reaction
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A reaction is which there are zero degrees of freedom
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isomorphous
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Having 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
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lever rule
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An equation 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
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line compound
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A compound whose composition is independent of temperature
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liquidus
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The temperature at which a liquid begins to freeze during equilibrium cooling conditions
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monotectic reaction
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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.
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monotectoid reaction
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The transformation, during cooling, of a solid phase isothermally and reversibly into two solids having different compositions from the initial solid
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pearlite
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A two-phase microstructure of alternate ferrite and cementite lamellae occurring in some steels.
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peritectic reaction
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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
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peritectoid reaction
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The transformation, during cooling, of two solid phases isothermally and reversibly into a solid having a different composition from either of the initial solids.
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phase
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A homogeneous portion of matter bounded by a surface so that it is mechanically separate from any other portion
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phase diagram
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A graphical representation showing the phase or phases present for a given composition as a function of temperature.
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primary solid phase
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The first solid that appears upon cooling an alloy from the liquid phase.
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solidus boundary
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The temperature at which a liquid phase disappears during equilibrium cooling conditions
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solute
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an atom or ion species that is dissolved in a host or solvent.
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solvus boundary
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The phase boundary that separates single-phase solid regions from two-phase solid regions
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state point
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Temperature, pressure, and composition of a phase
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tie line
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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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