3. (a) What is hot shortness? How does it affect the temperature at which eutectic alloys can be used? (b) An intermetallic compound is found for 38 wt.% Sn in the Cu-Sn phase diagram. Determine the formula for the compound. (c) What is an invariant reaction? Show that of for a two-component system the number degrees of freedom for an invariant reaction is zero.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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(d) The Al-Li phase diagram is shown in Figure Q3.
(i) Are any intermetallic compounds present? If so, identify them and determine
whether they are stoichiometric or nonstoichiometric. Determine the formula for
each compound.
(ii) Identify the three-phase reactions by writing down the temperature, the reaction in
equation form, the composition of each phase in the reaction, and the name of the
reaction.
800
700
L
600
4
B
500
9.9
400
20.4 Fr
300
200
a (Li)-
100
Al
20
40
60
80
Li
Weight percent lithium
Figure Q3
Al – Li phase diagram
Temperature (°C)
Transcribed Image Text:(d) The Al-Li phase diagram is shown in Figure Q3. (i) Are any intermetallic compounds present? If so, identify them and determine whether they are stoichiometric or nonstoichiometric. Determine the formula for each compound. (ii) Identify the three-phase reactions by writing down the temperature, the reaction in equation form, the composition of each phase in the reaction, and the name of the reaction. 800 700 L 600 4 B 500 9.9 400 20.4 Fr 300 200 a (Li)- 100 Al 20 40 60 80 Li Weight percent lithium Figure Q3 Al – Li phase diagram Temperature (°C)
3.
(a) What is hot shortness? How does it affect the temperature at which eutectic alloys can
be used?
(b) An intermetallic compound is found for 38 wt.% Sn in the Cu-Sn phase diagram.
Determine the formula for the compound.
(c) What is an invariant reaction? Show that of for a two-component system the number
degrees of freedom for an invariant reaction is zero.
Transcribed Image Text:3. (a) What is hot shortness? How does it affect the temperature at which eutectic alloys can be used? (b) An intermetallic compound is found for 38 wt.% Sn in the Cu-Sn phase diagram. Determine the formula for the compound. (c) What is an invariant reaction? Show that of for a two-component system the number degrees of freedom for an invariant reaction is zero.
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