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MSE Test 3
Terms in this set (46)
Maximum solid solubility on a phase diagram is controlled by factors described by these rules
Proeutectoid phase for a hypoeutectoid alloy
The melting reaction that occurs in an alloy system in which there is no change in composition when the solid transforms to the liquid
Gibbs phase rule
Relates the number of degrees of freedom to the number of components, phases, and state variables
Phase boundary separating a single-phase liquid region from a two-phase liquid plus solid region
When a liquid of one composition transforms to a liquid of another composition and a solid
The phase boundary separating a solid region from a two-phase solid region
On cooling, a liquid transforming to a liquid of a different composition and a solid
Compositions to the left of a eutectic
A region that is chemically and structurally homogeneous
The same composition
When a solid melts congruently, the liquid and solid have _____
At constant temperature, the fraction of the phases in a two-phase field _____ when the overall composition of the alloy is changed, but remains in the two-phase field.
The max number of phases that can be in equilibrium in a three component system at one atmosphere
On cooling when a two-phase liquid plus solid transforms to a solid phase the transformation is ____ in nature.
Two phases going to one
On cooling the peritectoid reaction written symbolically has ____.
Steels whose compositions are to the left of the eutectoid are referred to as ____ alloys.
Newly formed phase, which can reduce its Gibbs free energy by either growing or dissolving.
Two phases with same crystal structure and atomic spacings meet at a ____.
BCC phase of iron
Steel micro-structure consisting of spherical carbides distributed in ferrite.
When dislocations are present at an interface to relieve strain
When nucleation occurs at random sites in the parent phase
Process by which powders are densified at elevated temperature to form nearly fully dense micro-structure.
A two phase micro-structure with alternate lamellar micro-structure in steels
The only phase which can produce martensite as a result of rapid quench
When nucleation occurs at specific locations
Increasing the interfacial free energy ____ the likelihood of homogeneous nucleation.
Decreasing the amount of undercooling below the eutectoid temperature ____ the pearlite spacing.
Size of the interstitial holes
The solubility of carbon at a particular temperature in iron is controlled by
Iron carbide (Fe3C) is ____ with respect to graphite
Coring in metal casting is a direct consequence of ____ cooling from the melt to room temperature.
Alloys that can form an extensive amount of ____ are materials that have high hardenability.
The solubility of carbon in autensite is ____ than the solubility of carbon in ferrite.
Low melting temp
Why would alloys close to the eutectic composition be suitable for castings rather than alloy compositions far from the eutectic composition?
Coherent interface def
one to one correspondence of atomic planes
chemical mismatch and dislocations
no atomic match across interface
Which interface has the lowest energy
Incoherent b/c very little contact (total energy= sum of two separate surfaces)
Which interface has the highest energy
process for strengthening alloy by presence of fine, uniformly distributed precipitates in matrix solid
process of precipitation from a supersaturated solid solution (thermally activated diffusion process)
A material with a Poisson ratio of 0.5 is a(n) ____ material.
A hypothetical material with a Poisson ration of -0.1 will ____ in lateral dimensions when being under uni-axial tension.
Rubber typically has a Poisson ration close to ____.
For an incompressible material, the Young's modulus is ____ times the elastic shear modulus.
For an incompressible material, the elastic bulk modulus is equal to ____.
Recommended textbook explanations
Adel S. Sedra, Kenneth C. Smith
Signals and Systems
Alan S. Willsky, Alan V. Oppenheim, S. Hamid
Engineering Mechanics: Statics
James W. Nilsson
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