Phase Diagrams Lead-tin solder is commonly used for electrical connections due to its low melting point and electrical conductivity. Answer the following questions regarding the Pb-Sn phase diagram shown below: 1. What is the eutectic composition (wt%) and temperature? 2. What is the maximum solubility of tin in solid lead (wt%) and at what temperature does it occur? 3. Calculate the equivalent solubility in atomic %. 5. What is the solubility of lead in solid tin at the eutectic temperature? 6. Explain the sequence of events in terms of phase transitions, cooling rate, and microstructure development for a 30 wt% tin alloy cooling from 300°C to 100°C in room temperature air. Temperature °C Atomic Percent Tin 0 10 20 30 40 350 50 327.502°C 300 250 200 150 100 50 60 70 L 80 90 90 100 231.9681°C Pe (Pb) 183°C 18.3 61.9 97.8 (ẞSn) 0 0 10 20 30 Pb 40 50 60 70 80 Weight Percent Tin 90 1950 90 100 Sn

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Phase Diagrams
Lead-tin solder is commonly used for electrical connections due to its low melting point and
electrical conductivity. Answer the following questions regarding the Pb-Sn phase diagram
shown below:
1. What is the eutectic composition (wt%) and temperature?
2. What is the maximum solubility of tin in solid lead (wt%) and at what temperature does it
occur?
3. Calculate the equivalent solubility in atomic %.
5. What is the solubility of lead in solid tin at the eutectic temperature?
6. Explain the sequence of events in terms of phase transitions, cooling rate, and microstructure
development for a 30 wt% tin alloy cooling from 300°C to 100°C in room temperature air.
Transcribed Image Text:Phase Diagrams Lead-tin solder is commonly used for electrical connections due to its low melting point and electrical conductivity. Answer the following questions regarding the Pb-Sn phase diagram shown below: 1. What is the eutectic composition (wt%) and temperature? 2. What is the maximum solubility of tin in solid lead (wt%) and at what temperature does it occur? 3. Calculate the equivalent solubility in atomic %. 5. What is the solubility of lead in solid tin at the eutectic temperature? 6. Explain the sequence of events in terms of phase transitions, cooling rate, and microstructure development for a 30 wt% tin alloy cooling from 300°C to 100°C in room temperature air.
Temperature °C
Atomic Percent Tin
0 10 20 30 40
350
50
327.502°C
300
250
200
150
100
50
60
70
L
80
90
90
100
231.9681°C
Pe
(Pb)
183°C
18.3
61.9
97.8
(ẞSn)
0
0
10
20 30
Pb
40 50 60 70 80
Weight Percent Tin
90
1950
90
100
Sn
Transcribed Image Text:Temperature °C Atomic Percent Tin 0 10 20 30 40 350 50 327.502°C 300 250 200 150 100 50 60 70 L 80 90 90 100 231.9681°C Pe (Pb) 183°C 18.3 61.9 97.8 (ẞSn) 0 0 10 20 30 Pb 40 50 60 70 80 Weight Percent Tin 90 1950 90 100 Sn
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