MAT E 273 - EXAM 2 QUESTIONS AND ANSWERS 100%
ACCURATE.
Melting points - ✅✅Between solid and liquid phases
Sublimation points - ✅✅Between solid and vapor phases
Boiling points - ✅✅Between liquid and vapor phases
If the state point lies on a phase boundary between single phase fields, what phase(s) are
stable? - ✅✅The phases associated with the boundary
Solidus - ✅✅The temperature during solidification of an alloy at which the last of the liquid
phase solidifies.
Liquidus - ✅✅The line in a binary phase diagram above which only liquid occurs
Changes in pressure are generally less effective on ____ - ✅✅condensed matter
changes in pressure are generally more effective on ____ - ✅✅vapor states
Is it possible to have multiple phases equilibrated together (simultaneously present) for a
temperature-pressure state (point on the diagram) that is NOT on a phase boundary (line or
curve on the diagram) of a single-component system? - ✅✅No, because you can't have ice
and water at the same time
What is the approximate solid-solubility of water in NaCl? - ✅✅0 wt% water; water is insoluble
in NaCl
eutectic - ✅✅liquid transforms to two solid phases
, eutectoid - ✅✅one solid phase transforms to two other solid phases
For most materials, a tensile stress results in a _____ strain, whereas a compressive stress
results in a _____ strain. - ✅✅positive, negative
Engineering stress - ✅✅The instantaneous load applied to a specimen divided by its cross-
sectional area before any deformation.
Engineering strain - ✅✅the change in length of sample divided by the original length of the
sample
Hooke's Law applies in the ____
regime of the stress-strain curve for materials that exhibit a linear elastic response. - ✅✅initial
What is a reasonable value for the elastic modulus of a typical structural metal? - ✅✅300
GPa
What is a reasonable value for the yield stress (yield point) of a typical structural metal? -
✅✅400 MPa
A ____ value of elastic modulus implies a high magnitude of slope on the force-separation curve
( bonding curve, F versus r ) at the equilibrium bond distance (ro) for the material of interest. -
✅✅High
Without any other information to consider, it is reasonable to assume that a material with a low
elastic modulus will have a _____ melting point and a material with a high elastic modulus will
have a ____ melting point. - ✅✅Low; high
A material property that allows one to convert between perpendicular and oppositely-signed
elastic strains is called __________ . - ✅✅Poisson's ratio
ACCURATE.
Melting points - ✅✅Between solid and liquid phases
Sublimation points - ✅✅Between solid and vapor phases
Boiling points - ✅✅Between liquid and vapor phases
If the state point lies on a phase boundary between single phase fields, what phase(s) are
stable? - ✅✅The phases associated with the boundary
Solidus - ✅✅The temperature during solidification of an alloy at which the last of the liquid
phase solidifies.
Liquidus - ✅✅The line in a binary phase diagram above which only liquid occurs
Changes in pressure are generally less effective on ____ - ✅✅condensed matter
changes in pressure are generally more effective on ____ - ✅✅vapor states
Is it possible to have multiple phases equilibrated together (simultaneously present) for a
temperature-pressure state (point on the diagram) that is NOT on a phase boundary (line or
curve on the diagram) of a single-component system? - ✅✅No, because you can't have ice
and water at the same time
What is the approximate solid-solubility of water in NaCl? - ✅✅0 wt% water; water is insoluble
in NaCl
eutectic - ✅✅liquid transforms to two solid phases
, eutectoid - ✅✅one solid phase transforms to two other solid phases
For most materials, a tensile stress results in a _____ strain, whereas a compressive stress
results in a _____ strain. - ✅✅positive, negative
Engineering stress - ✅✅The instantaneous load applied to a specimen divided by its cross-
sectional area before any deformation.
Engineering strain - ✅✅the change in length of sample divided by the original length of the
sample
Hooke's Law applies in the ____
regime of the stress-strain curve for materials that exhibit a linear elastic response. - ✅✅initial
What is a reasonable value for the elastic modulus of a typical structural metal? - ✅✅300
GPa
What is a reasonable value for the yield stress (yield point) of a typical structural metal? -
✅✅400 MPa
A ____ value of elastic modulus implies a high magnitude of slope on the force-separation curve
( bonding curve, F versus r ) at the equilibrium bond distance (ro) for the material of interest. -
✅✅High
Without any other information to consider, it is reasonable to assume that a material with a low
elastic modulus will have a _____ melting point and a material with a high elastic modulus will
have a ____ melting point. - ✅✅Low; high
A material property that allows one to convert between perpendicular and oppositely-signed
elastic strains is called __________ . - ✅✅Poisson's ratio
