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The table shows the solidification temperatures for various alloys of Cadmium and Zinc - Leaving Cert Engineering - Question b - 2014
Question b
The table shows the solidification temperatures for various alloys of Cadmium and Zinc. % of Zinc in alloy | 0 | 10 | 14 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 1... 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 - 2014
Step 1
Using the graph paper supplied, draw the thermal equilibrium diagram according to the given data.
Answer
To create the thermal equilibrium diagram, plot the percentage of Zinc in alloy on the x-axis and the temperature (°C) on the y-axis.
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Begin by marking the start and end of solidification points on the graph for each percentage of Zinc.
- For 0% Zinc: Start = 321°C, End = 266°C
- For 10% Zinc: Start = 290°C, End = 266°C
- Continue this process for each percentage up to 100%.
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Draw the liquidus line from the starting points to indicate where the alloy changes from liquid to solid.
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Draw the solidus line at the end solidification point, where the changes from solid to liquid occur.
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Indicate the eutectic point where the composition is optimal for solidification without a pasty phase.
Step 2
Label and describe the main features of the diagram.
Answer
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Labeled Features:
- Liquid: The area above the liquidus line where the alloy is entirely in liquid form.
- Liquidus Line: The boundary where the alloy transitions from fully liquid to pasty state.
- Solidus Line: The line that indicates the transition from pasty to solid form.
- Eutectic Point: The composition of alloy where the transition occurs from liquid to solid without passing through a pasty phase.
- Solid: The area below the solidus line indicating that the alloy is completely solidified.
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Description of Features:
- The liquidus line marks the beginning of solidification.
- The solidus line marks the end of solidification, indicating that below this line the alloy is fully solid.
- The eutectic point denotes the optimal composition for solidification, allowing for a sharp transition.
Step 3