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(Solved): A lead-tin alloy (See Figure Q1) with composition (by weight) W_(Pb)=10% is held at a given tempera ...
A lead-tin alloy (See Figure Q1) with composition (by weight) W_(Pb)=10% is held at a
given temperature T.
Figure Q1. Lead-tin phase diagram
(a) At T =300\deg C, which is the dominant phase? Sketch a micrograph of the phase.
(b) At T=200\deg C, which is the dominant phase? Sketch a micrograph of the phase(s).
What is the composition of the dominant phase?
(5 marks)
The alloy is then cooled to 100\deg C, please answer the following questions:
(c) How many phases are present? What is the composition of each phase? Sketch a
micrograph, taking into account features of the phase diagram.
(d) What is the weight fraction of each phase?
(e) At 100\deg C, the density of Pb and Sn is 11.23 and 7.24gcm^(-3), respectively. What is
the volume fraction of each phase?