MAT E 273 - EXAM 2 QUESTIONS AND
ANSWERS 2026 VERIFIED.
Melting points - ANS Between solid and liquid phases
Sublimation points - ANS Between solid and vapor phases
Boiling points - ANS Between liquid and vapor phases
If the state point lies on a phase boundary between single phase fields, what phase(s) are
stable? - ANS The phases associated with the boundary
Solidus - ANS The temperature during solidification of an alloy at which the last of the liquid
phase solidifies.
Liquidus - ANS The line in a binary phase diagram above which only liquid occurs
Changes in pressure are generally less effective on ____ - ANS condensed matter
changes in pressure are generally more effective on ____ - ANS 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? - ANS No, because you can't have ice
and water at the same time
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, What is the approximate solid-solubility of water in NaCl? - ANS 0 wt% water; water is
insoluble in NaCl
eutectic - ANS liquid transforms to two solid phases
eutectoid - ANS 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. - ANS positive, negative
Engineering stress - ANS The instantaneous load applied to a specimen divided by its cross-
sectional area before any deformation.
Engineering strain - ANS 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. -
ANS initial
What is a reasonable value for the elastic modulus of a typical structural metal? - ANS 300
GPa
What is a reasonable value for the yield stress (yield point) of a typical structural metal? -
ANS 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. -
ANS High
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ANSWERS 2026 VERIFIED.
Melting points - ANS Between solid and liquid phases
Sublimation points - ANS Between solid and vapor phases
Boiling points - ANS Between liquid and vapor phases
If the state point lies on a phase boundary between single phase fields, what phase(s) are
stable? - ANS The phases associated with the boundary
Solidus - ANS The temperature during solidification of an alloy at which the last of the liquid
phase solidifies.
Liquidus - ANS The line in a binary phase diagram above which only liquid occurs
Changes in pressure are generally less effective on ____ - ANS condensed matter
changes in pressure are generally more effective on ____ - ANS 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? - ANS No, because you can't have ice
and water at the same time
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 11
, What is the approximate solid-solubility of water in NaCl? - ANS 0 wt% water; water is
insoluble in NaCl
eutectic - ANS liquid transforms to two solid phases
eutectoid - ANS 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. - ANS positive, negative
Engineering stress - ANS The instantaneous load applied to a specimen divided by its cross-
sectional area before any deformation.
Engineering strain - ANS 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. -
ANS initial
What is a reasonable value for the elastic modulus of a typical structural metal? - ANS 300
GPa
What is a reasonable value for the yield stress (yield point) of a typical structural metal? -
ANS 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. -
ANS High
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 11
