Foundations Of Materials Science And Engineering – Smith WF

All liquid ae Proeutectic a solidifying g Eutectic solidifyin utectic 2200) (ee =] ov =! Deal 60% Pb-40% Sn alloy Time below 183°C to room temperature lowers the tin content of the alpha phase and the lead content of the beta phase. However, at the lower temperatures the diffusion rate is much lower and equilibrium is not attained. Figure 8.126 shows the microstructure of a 40% Sn-—60% Pb alloy that has been slowly cooled. Note the dark-etching dendrites of the lead-rich alpha phase surrounded by eutectic. Figure 8.13 shows a cooling curve for a 60% Pb—40% Sn alloy.

Note that a slope change occurs at the liquidus at 245°C and a horizontal thermal arrest appears during the freezing of the eutectic. Example Problem 8.2 ise Make phase analyses of the equilibrium (ideal) solidification of lead-tin alloys at the following points in the lead-tin phase diagram of Fig. 8.11: (a) At the eutectic composition just below 183°C (eutectic temperature). (b) The point c at 40% Sn and 230°C. (c) The point d at 40% Sn and 183°C + AT.

(d) The point e at 40% Sn and 183°C — AT. Solution: (a) At the eutectic composition (61.9% Sn) just below 183°C: Phases present: Compositions of phases: Amounts of phases: alpha 19.2% Sn in alpha phase Wt % alpha phase!

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