Experiment This experiment will involve determining the overall composition of an Al-Cu mixture, heating it in a ceramic crucible to temperatures expected to result in a single-phase liquid, and then allowing the liquid to cool until it freezes. 1100+ 1000 Temperature C Liquid 900- 800. 700. 600. 500. 548.2°C (Al)+0 400- (AI) (Cu) 300. 0 ΑΙ 10 20 30 40 50 60 70 Weight Percent Copper Figure 1: Al-Cu Phase Diagram 80 90 100 Cu Procedure Determine the masses of the aluminum and copper samples using a digital scale. These masses will enable you to calculate the overall composition of the alloy. Place the aluminum and copper in a ceramic crucible. Using protective equipment, place the crucible in a furnace heated to 1000°C. When the sample has melted into a single-phase liquid, remove from the furnace and place on a refractory brick. Begin recording the temperature of the alloy with a thermocouple. Take temperature readings every 5 seconds and note any changes in the alloy as it cools. Allow the alloy to cool to room temperature. Using the Al-Cu phase diagram provided, calculate the overall composition of the alloy and plot it as a vertical line. Answer the following questions: 1. Is this alloy hypoeutectic or hypereutectic? 2. What is the atomic fraction of copper in this alloy? 3. At what temperature should the first solid appear? 4. What is the first solid to appear and what is its composition? 5. What is the second solid to appear and what is its composition? 6. If this alloy were reheated, what would be the composition of the first liquid to appear? 7. Estimate the shape of a plot of temperature vs. time for the cooling process from 1000°C to room temperature. Explain the features of this cooling curve with reference to the phase diagram, including any curvature or changes in slope. 8. Offer an explanation as to why neither pure metal shows substantial solid solubility of the other. Also, why might the solubility of Al in Cu at 300°C be somewhat higher than that of Cu in Al at the same temperature?
Experiment This experiment will involve determining the overall composition of an Al-Cu mixture, heating it in a ceramic crucible to temperatures expected to result in a single-phase liquid, and then allowing the liquid to cool until it freezes. 1100+ 1000 Temperature C Liquid 900- 800. 700. 600. 500. 548.2°C (Al)+0 400- (AI) (Cu) 300. 0 ΑΙ 10 20 30 40 50 60 70 Weight Percent Copper Figure 1: Al-Cu Phase Diagram 80 90 100 Cu Procedure Determine the masses of the aluminum and copper samples using a digital scale. These masses will enable you to calculate the overall composition of the alloy. Place the aluminum and copper in a ceramic crucible. Using protective equipment, place the crucible in a furnace heated to 1000°C. When the sample has melted into a single-phase liquid, remove from the furnace and place on a refractory brick. Begin recording the temperature of the alloy with a thermocouple. Take temperature readings every 5 seconds and note any changes in the alloy as it cools. Allow the alloy to cool to room temperature. Using the Al-Cu phase diagram provided, calculate the overall composition of the alloy and plot it as a vertical line. Answer the following questions: 1. Is this alloy hypoeutectic or hypereutectic? 2. What is the atomic fraction of copper in this alloy? 3. At what temperature should the first solid appear? 4. What is the first solid to appear and what is its composition? 5. What is the second solid to appear and what is its composition? 6. If this alloy were reheated, what would be the composition of the first liquid to appear? 7. Estimate the shape of a plot of temperature vs. time for the cooling process from 1000°C to room temperature. Explain the features of this cooling curve with reference to the phase diagram, including any curvature or changes in slope. 8. Offer an explanation as to why neither pure metal shows substantial solid solubility of the other. Also, why might the solubility of Al in Cu at 300°C be somewhat higher than that of Cu in Al at the same temperature?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Question
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It's not even that Idk how to do it, I'm very confused at that what parameters I should use to even begin answering.
The initial masses of Ala dn Cu are 94.14g and 21.52g respectively
Transcribed Image Text:Experiment
This experiment will involve determining the overall composition of an Al-Cu mixture, heating it
in a ceramic crucible to temperatures expected to result in a single-phase liquid, and then
allowing the liquid to cool until it freezes.
1100+
1000
Temperature C
Liquid
900-
800.
700.
600.
500.
548.2°C
(Al)+0
400-
(AI)
(Cu)
300.
0
ΑΙ
10
20
30 40 50 60 70
Weight Percent Copper
Figure 1: Al-Cu Phase Diagram
80 90
100
Cu
Procedure
Determine the masses of the aluminum and copper samples using a digital scale. These masses
will enable you to calculate the overall composition of the alloy. Place the aluminum and copper
in a ceramic crucible. Using protective equipment, place the crucible in a furnace heated to
1000°C. When the sample has melted into a single-phase liquid, remove from the furnace and
place on a refractory brick. Begin recording the temperature of the alloy with a thermocouple.
Take temperature readings every 5 seconds and note any changes in the alloy as it cools. Allow
the alloy to cool to room temperature.
Using the Al-Cu phase diagram provided, calculate the overall composition of the alloy and plot
it as a vertical line. Answer the following questions:
1. Is this alloy hypoeutectic or hypereutectic?
2. What is the atomic fraction of copper in this alloy?
3. At what temperature should the first solid appear?
4. What is the first solid to appear and what is its composition?
5. What is the second solid to appear and what is its composition?
6. If this alloy were reheated, what would be the composition of the first liquid to appear?
7. Estimate the shape of a plot of temperature vs. time for the cooling process from 1000°C
to room temperature. Explain the features of this cooling curve with reference to the
phase diagram, including any curvature or changes in slope.
8. Offer an explanation as to why neither pure metal shows substantial solid solubility of the
other. Also, why might the solubility of Al in Cu at 300°C be somewhat higher than that
of Cu in Al at the same temperature?
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