The American University in The American University in Cairo Cairo Mechanical Engineering Department Mechanical Engineering Department MENG 426: Metals, Alloys & Composites MENG 426: Metals, Alloys & Composites Interactive MENG 426 Lab Tutorials Interactive MENG 426 Lab Tutorials Experiment (3) Eutectic, Hyper- & Hypo- Eutectic, Hyper- & Hypo- Alloys Alloys Prepared by Eng. Moataz M. Attallah Eng. Moataz M. Attallah Fall 2002 Fall 2002
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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
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.