100 (iv) Given that the average density of a phase is determined as Pa = calculate the PA PB volume fractions of the phases at the given compositions and at 150°C. Take the densities of lead and tin as 11.34 g/cm and 7.36 g/cm? while the mass fraction of a is 0.21. (v) Name and describe four industrial applications of lead-tin alloys.
100 (iv) Given that the average density of a phase is determined as Pa = calculate the PA PB volume fractions of the phases at the given compositions and at 150°C. Take the densities of lead and tin as 11.34 g/cm and 7.36 g/cm? while the mass fraction of a is 0.21. (v) Name and describe four industrial applications of lead-tin alloys.
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
Answer part (iv) and (v)
Transcribed Image Text:Question One (Compulsory)
Composition (atk Sn)
100
20
40
60
80
327C
B00
300
Liquid
500
232C
400
200
183C
07.8
18.3
61.9
300
100-
H200
100
BO
100
20
40
60
Pb)
Compesition (wt% Sn)
Figure 1: Lead -tin phase diagram
Figure I above shows a lead-tin (alloy) phase diagram. Consider an alloy composition of 55 wt%
Sn - 45 wt% Pb. Answer the following questions:
(i)
Name the phases present and their compositions in the alloy at 150°C.
(ii)
Describe the structural and composition changes in the alloy when it is cooled from 190°C
to 20°C.
(iii) What are the compositions of phases at the eutectic point and why is this point important for the
alloy?
(iv) Given that the average density of a phase is determined as Pa =
100
,calculate the
PA
PB
volume fractions of the phases at the given compositions and at 150°C. Take the densities of
lead and tin as 11.34 g/cm' and 7.36 g/cm' while the mass fraction of a is 0.21.
(v)
Name and describe four industrial applications of lead-tin alloys.
ta aroundu
(3.) arudua
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