The American University in Cairo Mechanical Engineering Department MENG 426: Metals, Alloys & Composites Interactive MENG 426 Lab Tutorials Experiment.
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The American University in CairoThe American University in CairoMechanical Engineering DepartmentMechanical Engineering Department
MENG 426: Metals, Alloys & CompositesMENG 426: Metals, Alloys & Composites
Interactive MENG 426 Lab TutorialsInteractive MENG 426 Lab Tutorials
Experiment (3)
Eutectic, Hyper- & Hypo- AlloysEutectic, Hyper- & Hypo- Alloys
Prepared byEng. Moataz M. AttallahEng. Moataz M. Attallah
Fall 2002Fall 2002
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
OutlineOutline
1. Introduction: Phase diagrams
2. Alloy systems
3. Invariant Reactions
4. Eutectic Reaction
5. Specimen
6. Results
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Phase Diagram:
Graphical representation for the material
(pure/mixture/binary alloy/tertiary alloy)
within a temperature range at a range of compositions, showing the existing phases & any transformation reactions.
IntroductionIntroduction
Equilibrium Diagrams
• Equilibrium cooling: slow cooling that does not deform the structure.
Phase Diagrams A B CPhase Diagrams A B C
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Unary Phase DiagramUnary Phase Diagram
http://mst-online.nsu.edu/mstonline/metals/Figure59.htm
http://www.eng.auburn.edu/~wfgale/intro_metals/graphics/fig10_pure_fe.swf
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Binary Phase DiagramsBinary Phase Diagrams
No Solubility IsomorphousExtensive Solubility
Partial SolubilityPartial SS
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Isomorphous SystemIsomorphous SystemExtensive Solid Solution Strengthening (SSS)Extensive Solid Solution Strengthening (SSS)
Liquidus
Solidus
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Polymorphous SystemPolymorphous SystemPartial Solid Solution Strengthening (SSS)Partial Solid Solution Strengthening (SSS)
Liquidus
Solidus
Terminal Solid Solution
Solvus
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
SSS ParametersSSS Parameters
Difference in atomic radii less than 15%
Same crystal structure Minimal difference in electro-
negativity Same valence number
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Interstitial Solid SolutionInterstitial Solid Solution
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
ISS ParametersISS Parameters
Existence of interstitial site that can accommodate a small atom
Interstitials are: H, C, N, O
Invariant ReactionsInvariant Reactions
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Invariant ReactionsInvariant Reactions
Phase transformation reactions that take place at a specific temperature and composition (zero degree of freedom).
Types:Eutectic L
cooling
Eutecticoid cooling
Peritectic Lcooling
Peritectoid cooling
Montectic L Lcooling
1 2
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Eutectic ReactionEutectic Reaction
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Eutectic MicrostructureEutectic Microstructure
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Eutectic Morphologies*Eutectic Morphologies** * Morphology means the form, shape or outward microstructure of a phase
lamellarlamellar rodlike
globular acicular
W. F. Smith
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Eutectic ModelEutectic Model
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
SpecimensSpecimens
•Specimen (1): 8.4% phosphorus content: etch or 30 seconds in aqueous ferrous chloride. •Specimen (2): 4.5% phosphorus content: etch or 40 seconds in aqueous ferrous chloride, which makes a dark surface after etching. •Specimen (3): 10.5% phosphorus content: etch for several seconds in a solution containing 2 parts of water/1 part ammonia solution and hydrogen peroxide.
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Cu-P Phase DiagramCu-P Phase Diagram
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Cu-P Phase transformationCu-P Phase transformation
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Lab ReportLab Report
Required: A "neat" sketch for the viewed
microstructures. Describe the phase transformation for
each specimen from the liquid state to the solid state with the aid of the (Cu-Cu3P)
phase diagram.
Introduction
Nomenclature
Phase diagrams
Invariant Reactions
Eutectic Reaction
Microstructure
Morphology
Model
Specimen
Lab report
Lab Report (2) Due DateLab Report (2) Due Date
Due to the 6th of October holiday, next week labs are cancelled.
Lab report #2 is due in
Tuesday October 8th class
Questions?Questions?
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