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MECH 221 Practice Problem Set # 4 Concordia University
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MECH 221 Practice Problem Set # 4 Concordia University
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MECH 221 Practice Problem Set # 4 Concordia UniversityNote: These questions will be discussed during the tutorial sessions on
October 30th.
Question 1. Using the Cu-Ni phase diagram, calculate how many
kilograms of nickel must be added to 1.75 kg of copper to yield an alloy
with a liquidus temperature of 1300°C?
Solution:
According to the copper-nickel phase diagram, the composition at the
1300°C liquidus temperature is about 43 wt% Ni. In order to determine
the amount of nickel that must be added to 1.75 kg Ni, it is necessary
to use Equation 4.3a. If we let mNi represent the mass of nickel
required, then Equation4.3a takes the form:
43 wt% Ni=mNi / (1.75kg +
mNi) × 100 And solving this expression for mNi
leads to mNi= 1.32 kg
, Question 2:
For a Pb-Sn alloy of composition 80wt%Sn-20wt%Pb, make schematic
sketches of the microstructure that would be observed for conditions
of very slow cooling at the following temperatures: 300°C, 210°C,
190°C, 180°C. Label the phases and indicate their compositions
(approximate).
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