Thermodynamic Study of the Mg-Ca-Zn system Shanae Henry Philadelphia, Pennsylvania, Sophomore, Lankenau High School Hakeem Jackson Philadelphia, Pennsylvania, Junior, Lankenau High School Ryan Robinson Philadelphia, Pennsylvania, Senior, Lankenau High School
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Thermodynamic Study of the Mg-Ca-Zn system Shanae Henry Philadelphia, Pennsylvania, Sophomore, Lankenau High School Hakeem Jackson Philadelphia, Pennsylvania,
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Thermodynamic Study of the Mg-Ca-Zn system
Shanae HenryPhiladelphia, Pennsylvania, Sophomore, Lankenau High School
Hakeem JacksonPhiladelphia, Pennsylvania, Junior, Lankenau High School
Ryan RobinsonPhiladelphia, Pennsylvania, Senior, Lankenau High School
Presentation Outline:
• Introduction
• Background
• Methods
• Experiment
• Results
• Microstructural Analysis
What is Thermodynamics?
Thermodynamics is the study of Gibbs free energy.
• Gibbs free energy– G=H-TS
• Phase stability– Lowest Gibbs free
energy
www.humanthermodynamics.com
Objective
Purpose:
Perform a Diffusion Couple to validate the existence of the Ca2Mg5Zn13 that was predicted by previous researchers.
Hypothesis:
The predicted phase Ca2Mg5Zn13 exists [ is stable] at 335 and 160 degrees Celsius.
What is Diffusion?
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.
Materials Properties:
Magnesium
• Flexible
• Light Weight
Calcium:
• Rather soft
• Reacts with water
Zinc:
• Reasonable conductor of electricity
• Good corrosion resistance
Phase Transformation
•The process of one phase to another
•The rate at which a phase will become stable
•Also we can use Phase Transformations to see when two or more substances co-exist
Phase Diagram
• Graphical representation that shows the phases that are present
What can be seen by the phase diagram?• Number of phases present• Composition of each phase