MSE101H1 Lecture Notes - Vacancy Defect, Austenite, Cementite
3 Feb 2014
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10. 16 briefly explain why, upon solidification, an alloy of eutectic composition forms a microstructure consisting of alternating layers of the two solid phases. In order to make this determination we need to set up the appropriate lever rule expression for each of these quantities. From figure 10. 20 and at 460 c, c = 41 wt% pb, = 81 wt% pb, and ceutectic = 67 wt% pb. Solving for c0 gives c0 = 51. 4 wt% pb. Now the analogous expression for total which yields a value of 47 wt% pb for c0. Therefore, since these two c0 values are different, this alloy is not possible. Solution (a) this portion of the problem asks that we determine the mass fractions of and phases for an 80 wt% In order to do this it is necessary to employ the lever rule using a tie line that extends entirely across the + phase field.
