$R2IWRHM - The Eutectic Pb/Sn Phase Diagram Abstract The...

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The Eutectic Pb/Sn Phase Diagram Abstract The purpose of this lab experiment was to discern the heating and cooling curves from different configurations of lead and tin alloys. The following equipment was used to perform the experiment and determine the heating and cooling curves: alloy samples in stainless steel tubes, a furnace, furnace controllers, thermocouples, and a computer data system. We used the following configurations in the lab experiment: Pb, 10%, 20%, 30%, 40%, 50%, 62% (eutectic percentage), 70%, 80%, and Sn. From the data that was collected, we determined the temperatures that had sudden changes in cooling. The sudden changes that occurred indicate a phase change. Graphs were then made to represent the data collected and the graphs consist of the phase transitions, thermal arrests, and under-cooling of each sample. Introduction A phase diagram is any graphical representation of the state variables associated with microstructures through the Gibbs phase rule, which is defined as F = C P + 2 where F is the number of degrees of freedom, C , is the number of components, and P is the number of phases. The degrees of freedom are the number of independent variables available to the system. The important state variables over which the
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materials engineer has control in establishing microstructure are temperature, pressure, and composition.
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