For a lead-tin alloy of composition 80 wt Sn–20 wt Pb and at 180^\circ C(335^

f480forever2rz

f480forever2rz

Answered question

2021-11-24

For a lead-tin alloy of composition 80 wt Sn–20 wt Pb and at 180C(335F), do the following:
a) Determine the mass fractions the α and β phases.
b) Determine the mass fractions of primary β and eutectic microconstituents.
c) Determine the mass fraction of eutectic β

Answer & Explanation

inenge3y

inenge3y

Beginner2021-11-25Added 20 answers

a)  CβP=18.3,Ce=61.9, and CβT=97.8 The mass fraction is
Wα=C1C0C1C2=97.88097.818.3=0.22 
Wβ=1Wα=10.22=0.78 

b) WβP=8061.997.861.9=0.5 
WeP=1Wβ=10.5=0.5 


c) The mass fraction of the eutectic comes from: 
Wβe=WβWβP=0.780.5=0.28 
 

 

a) 0.22 and 0.78 
b) 0.5 and 0.5 
c) 0.28

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