بتالتانتمةنو

1. Phase diagram

2. A phase
• may be defined as a homogeneous portion of a system
that has uniform physical and chemical characteristics
• example,
1. Ice-water
2. the sugar–water syrup solution is one phase, and solid
sugar is another
3. Fe

3. Alloy
• Component
• Composition
• Pressures and temperature

4. control
Temperature Pressures Composition
Design
Components Or Elements
phase diagram
Is show much of the information about the control of the phase structure of
a special system is suitable and brief displayed

5. components
• are pure metals and/or compounds of which an alloy is composed. For
example, in a copper–zinc brass, the components are Cu and Zn
system
• may refer to a specific body of material under consideration
• it may relate to the series of possible alloys consisting of the same
components but without regard to alloy composition (e.g., the iron–
carbon system).

6. Solubility Limit
solution
solute solvent

8. Phase Equilibrium
• Have the same crystal structure
• Have similar electronegativity
• Have similar atomic radii
• Have similar valence

10. Unary PD Binary PD
Ternary PD

11. 1. Binary Isomorphous phase diagram:
complete liquid and solid solubility of the two components
Axes
• Composition axis
• Temperature axis
Points
• Melting point of Cu: 1085
• Melting point of Ni: 1453
Lines
• Liquidus line: the line between L and L+α
• Solidus line: the line between L+α and α
Area
• Single phase
• Two phases

12. 1-Types of phases present.
If we know T and Co
A (TA, 35):
1 phase L
B(TB, 35):
2 phases: L + α
D(TD,35)
1 phase L
2-The composition of each phase
If we know T and Co:CL = Co = 35 wt% Ni
At TA = 1320°C:
Only Liquid (L)
At TD = 1190°C:
Only Solid (α)
At TB = 1250°C:
Both a and L
CL = Cliquidus = 32 wt% Ni
Cα = Csolidus = 43 wt% Ni

14. Cooling curve
• Draw
• Freezing rangr

18. Development microstructure of PD