# Help determining phase diagram of Pb-Sb alloy

• jpandrew19
In summary, constructing a phase diagram for the Pb-Sb alloy requires collecting data points for different weight compositions, plotting them on a graph, and connecting them to form the solidus line. Additional thermodynamic calculations and utilizing provided cooling curves can further improve the accuracy of the diagram.
jpandrew19
Hello,

I'm new to the forums and hope this is the correct area to post this question:

I've Recently conducted a lab in class where we melted an alloy of Pb-Sb in order to determine its cooling curve. We did two different weight compositions (11.2% Sb) and (17.5% Sb) and recorded their temperatures upon heating them to an initial temperature of approximately 350 C. Additionally, our lab provides a series of crudely drawn cooling curves of other known weight compositions that were done as well.

I'm aware these cooling curves serve as the liquidus line of my phase diagram but am confused as to what sort of methods I should approach to help construct the rest of my phase diagram with the known information that I have.

Any help is appreciated,

Thanks.

Hello there,

Thank you for sharing your lab results with us. It sounds like you have already made some progress in understanding the cooling curves and their relationship to the liquidus line on a phase diagram.

To construct the rest of your phase diagram, you will need to continue collecting data points for different weight compositions. This can be done by conducting additional experiments with different weight percentages of Pb and Sb, and recording their cooling curves. You can also utilize the cooling curves provided in your lab to fill in any missing data points.

Once you have a sufficient number of data points, you can plot them on a graph and connect them to form the solidus line. This line represents the temperature at which the alloy completely solidifies. By connecting the liquidus and solidus lines, you will have a complete phase diagram for your Pb-Sb alloy.

Additionally, you can also use thermodynamic calculations and equations to further verify and refine your phase diagram. This may involve determining the enthalpy of fusion and other thermodynamic properties of the alloy.

I hope this helps guide you in constructing your phase diagram. Feel free to ask any further questions or share your progress with us. Good luck with your research!

## 1. What is a phase diagram?

A phase diagram is a graphical representation of the different phases or states of a substance at different temperatures and pressures. It shows the conditions under which a substance will exist as a solid, liquid, or gas.

## 2. Why is it important to determine the phase diagram of a Pb-Sb alloy?

Knowing the phase diagram of a Pb-Sb alloy is important for understanding the behavior of this particular alloy and its properties. It can also help in predicting how the alloy will behave under different conditions and during manufacturing processes.

## 3. How is the phase diagram of a Pb-Sb alloy determined?

The phase diagram of a Pb-Sb alloy is determined through experimental methods such as differential thermal analysis, X-ray diffraction, and microscopy. These techniques involve heating and cooling the alloy and observing its changes in structure and composition.

## 4. What are the phases present in the Pb-Sb alloy phase diagram?

The phases present in the Pb-Sb alloy phase diagram are liquid, solid solution, and intermetallic compounds. The solid solution phase is further divided into two regions, alpha and beta, while the intermetallic compounds phase is divided into three regions, alpha, beta, and gamma.

## 5. How can the phase diagram of a Pb-Sb alloy be used in practical applications?

The phase diagram of a Pb-Sb alloy can be used in practical applications such as determining the best alloy composition for specific properties, predicting the behavior of the alloy during manufacturing processes, and troubleshooting any issues that may arise during production.

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