MSE 210 Eutectic Microstructures Lecture 7

MSE 210 Eutectic Microstructures Lecture 7 - MSE 210...

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MSE 210 Eutectic Microstructures Lecture 7
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Pb-Sn Phase Diagram L + α L + β α + β 200 T (°C) 18.3 C , wt% Sn 20 60 80 100 0 300 100 L (liquid) α 183°C 61.9 97.8 β
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C o < 2 wt% Sn Result: --at extreme ends --polycrystal of α grains i.e., only one solid phase. Adapted from Fig. 9.11, Callister 7e. Microstructures in Eutectic Systems: I 0 L + α 200 T (°C) C o , wt% Sn 10 2 20 C o 300 100 L α 30 α + β 400 (room T solubility limit) T E (Pb-Sn System) α L L: C wt% Sn o
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2 wt% Sn < C o < 18.3 wt% Sn Result: Initially liquid + α then α alone finally two phases α polycrystal fine β -phase inclusions Adapted from Fig. 9.12, Callister 7e. Microstructures in Eutectic Systems: II Pb-Sn system L + α 200 T (°C) C o , wt% Sn 10 18.3 20 0 C o 300 100 L α 30 α + β 400 (sol. limit at T E ) T E 2 (sol. limit at T room ) L α L: C wt% Sn α β α : C wt% Sn
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C o = C E Result: Eutectic microstructure (lamellar structure) --alternating layers (lamellae) of α and β crystals. Adapted from Fig. 9.13, Callister 7e. Microstructures
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MSE 210 Eutectic Microstructures Lecture 7 - MSE 210...

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