Matse 201 Exam 2 Questions With Verified Answers
phase
a chemically and structurally homogenous state of matter
α
single alpha phase; where solid solution between 2 components exist
L+ α
2 phase region, mix of liquid phase and alpha phase containing both components
;
Degrees o...
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Matse 201 Exam 2 Questions With Verified
Answers
phase
a chemically and structurally homogenous state of matter
α
single alpha phase; where solid solution between 2 components exist
L+ α
2 phase region, mix of liquid phase and alpha phase containing both components
;
Degrees of freedom
refers to number of externally controlled variables( temp, pressure, system composition) which must
be specified to define the state of the system
F=C-P+2
where ..
F= deg. of freedom
C= # components
P= # phases
Degree of Freedom- Constant pressure model
F= C-P+1
C= # components
P= #phases
The Lever Rule
used to determine relative amounts of each phase at equilibrium, based on mass balance
slow cooling
Larger crystals
fast cooling
Smaller crystals
Eutectic Phase Diagram
gives separation into two solid phases, α and β
eutectic temperature
The temperature at which a eutectic reaction takes place., lower than the MP of either compound
eutectic composition
The composition of the liquid phase that reacts to form two new solid phases at the eutectic
temperature.
, eutectoid
One solid phase transforms to two other solid phases.
eutectic point
point on the phase diagram at which the two solid phases melt completely to form a single-phase
liquid
hypereutectic composition
-any composition that lies to the right of the eutectic point
hypoeutectic composition
-any composition that lies to the left of the eutectic point
limited solid solution
components A and B form distinct phases and each is partially soluble in each other
eutectoid reaction
a reaction in which, upon cooling, one solid phase transforms isothermally and reversibly into two
new solid phases that are intimately mixed
ALL SOLIDS
peritectic reaction
happens when components form and intermediate compound that melts incongruently. The liquid
has a different composition from that of the solid that melted
intermediate compounds
melt co77
a phase that has a composition intermediate between two other phases
Processing
the act of taking refined materials, typically from powder or liquid form, to a final product w/ desired
properties
4 types of metal processing
Wrought, casting, joining and other
Wrought processing (M)
type of metal processing; aka forming, the use of heat and force to shape metal into a finished shape;
requires certain amount of ductility
4 categories of Wrought processing
- rolling
- forging
-extrusion
-drawing
** these are all single step processes
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