consider a 40 at% Pb - 60 at% Mg alloy ( Use pb-mg phase diagram shown below and
ID: 836184 • Letter: C
Question
consider a 40 at% Pb - 60 at% Mg alloy ( Use pb-mg phase diagram shown below and assume equilibrium conditions)
a) calculate the composition of this alloy in weight percent.
b)what are the compositions of the phases present for this at 40 at%Pb-60at% Mg alloy at 400 C?
c) At 400 C what are the relative amounts of the phases present for this 40 at%Pb - 60 at %Mg?
The magnesium-lead phase diagram. [Adapted from Phase Diagrams of Binary Magnesium Alloys. A. A. Nayeb-Hashemi and J. B. Clark (Editors). 1988. Reprinted by permission of ASM International. Materials Park. OH.]Explanation / Answer
answer:-
(a) We are given that the mass fractions of ? and liquid phases are both 0.5 for a 40 wt% Pb-60 wt%
Mg alloy and are asked to estimate the temperature of the alloy. Using the appropriate phase diagram, Figure 9.18,
by trial and error with a ruler, a tie line within the ? + L phase region that is divided in half for an alloy of this
composition exists at about 540
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