solution vs mixture
single phase vs multiple phases
solubility limit
maximum concentration for which only a single phase exists
effect of temperature and composition
they both alter the number of phases, just look at any wt% diagram
binary isomorphous
teardrop
binary eutectic
Pb-Sn
unary
water, only one element
cooling of a Cu-Ni alloy
phase diagram tie line
cored vs equilibrium structures
,Eutectic
has a special composition with a minimum melting temperature
solvus line
the solid solubility limit line separating the a and a b phase regions
solidus line
the boundary AB between the a and a L fields is the
liquidus line
the temperature at which the alloys become totally liquid decreases
along the
phenomenon of coring and why it occurs
Coring is the phenomenon whereby concentration gradients exist
across grains in polycrystalline alloys, with higher concentrations of
the component having the lower melting temperature at the grain
boundaries. It occurs, during solidification, as a consequence of cooling
rates that are too rapid to allow for the maintenance of the equilibrium
composition of the solid phase.
Cite one undesirable consequence of coring.
One undesirable consequence of a cored structure is that, upon heating,
the grain boundary regions will melt first and at a temperature below
the equilibrium phase boundary from the phase diagram; this melting
results in a loss in mechanical integrity of the alloy.
Briefly explain why, upon solidification, an alloy of eutectic composition
forms a microstructure consisting of alternating layers of the two solid
phases
, Upon solidification, an alloy of eutectic composition forms a
microstructure consisting of alternating layers of the two solid phases
because during the solidification atomic diffusion must occur, and with
this layered configuration the diffusion path length for the atoms is a
minimum
We have an expert-written solution to this problem!
What is the distinction between hypoeutectoid and hypereutectoid
steels
A "hypoeutectoid" steel has a carbon concentration less than the
eutectoid; on the other hand, a "hypereutectoid" steel has a carbon
content greater than the eutectoid.
In a hypoeutectoid steel, both eutectoid and proeutectoid ferrite exist.
Explain the difference between them. What will be the carbon
concentration in each?
For a hypoeutectoid steel, the proeutectoid ferrite is a microconstituent
that formed above the eutectoid temperature. The eutectoid ferrite is
one of the constituents of pearlite that formed at a temperature below
the eutectoid. The carbon concentration for both ferrites is 0.022 wt% C.
We have an expert-written solution to this problem!
hypoeutectic vs hypereutectic
peritectic
Binary eutectic systems
3 single phase regions (L, a, b)
Limited solubility
single phase vs multiple phases
solubility limit
maximum concentration for which only a single phase exists
effect of temperature and composition
they both alter the number of phases, just look at any wt% diagram
binary isomorphous
teardrop
binary eutectic
Pb-Sn
unary
water, only one element
cooling of a Cu-Ni alloy
phase diagram tie line
cored vs equilibrium structures
,Eutectic
has a special composition with a minimum melting temperature
solvus line
the solid solubility limit line separating the a and a b phase regions
solidus line
the boundary AB between the a and a L fields is the
liquidus line
the temperature at which the alloys become totally liquid decreases
along the
phenomenon of coring and why it occurs
Coring is the phenomenon whereby concentration gradients exist
across grains in polycrystalline alloys, with higher concentrations of
the component having the lower melting temperature at the grain
boundaries. It occurs, during solidification, as a consequence of cooling
rates that are too rapid to allow for the maintenance of the equilibrium
composition of the solid phase.
Cite one undesirable consequence of coring.
One undesirable consequence of a cored structure is that, upon heating,
the grain boundary regions will melt first and at a temperature below
the equilibrium phase boundary from the phase diagram; this melting
results in a loss in mechanical integrity of the alloy.
Briefly explain why, upon solidification, an alloy of eutectic composition
forms a microstructure consisting of alternating layers of the two solid
phases
, Upon solidification, an alloy of eutectic composition forms a
microstructure consisting of alternating layers of the two solid phases
because during the solidification atomic diffusion must occur, and with
this layered configuration the diffusion path length for the atoms is a
minimum
We have an expert-written solution to this problem!
What is the distinction between hypoeutectoid and hypereutectoid
steels
A "hypoeutectoid" steel has a carbon concentration less than the
eutectoid; on the other hand, a "hypereutectoid" steel has a carbon
content greater than the eutectoid.
In a hypoeutectoid steel, both eutectoid and proeutectoid ferrite exist.
Explain the difference between them. What will be the carbon
concentration in each?
For a hypoeutectoid steel, the proeutectoid ferrite is a microconstituent
that formed above the eutectoid temperature. The eutectoid ferrite is
one of the constituents of pearlite that formed at a temperature below
the eutectoid. The carbon concentration for both ferrites is 0.022 wt% C.
We have an expert-written solution to this problem!
hypoeutectic vs hypereutectic
peritectic
Binary eutectic systems
3 single phase regions (L, a, b)
Limited solubility
