Photo AI
The table shows the solidification temperatures for various alloys of Cadmium and Zinc - Leaving Cert Engineering - Question b - 2018
Question b
The table shows the solidification temperatures for various alloys of Cadmium and Zinc. The melting temperature of Zinc is 419°C and the melting temperature of Cadmi... show full transcript
Worked Solution & Example Answer:The table shows the solidification temperatures for various alloys of Cadmium and Zinc - Leaving Cert Engineering - Question b - 2018
Step 1
Draw the equilibrium diagram according to the information given above and the data in the table
Answer
To graph the equilibrium diagram:
- Label the x-axis for the percentage of Zinc (0% to 100%) and the y-axis for temperature (°C).
- Plot the data points for the start and end of solidification based on the provided table. For instance, at 60% Zinc, the start of solidification is about 328°C and the end is 266°C.
- Connect the points to create the liquidus and solidus lines.
- Identify the eutectic point where the solid and liquid phases coexist at the lowest temperature.
Step 2
Step 3
For the alloy with 60% Zinc, determine from the diagram the ratio of the phases at 300 °C
Answer
At 300°C, referring to the constructed diagram:
- Determine the lengths of segments.
- Letting A denote the length of the liquid phase, B the length of the solid phase, and C the total length, calculate the ratio using the values derived from the graph.
- The ratio will be calculated by rac{|AB|}{|BC|} = rac{26}{40} or simplified according to the graph measurements.