# 1. Below is the phase diagram of Pb-Sn alloy. (a) Describe what happens to a 20%-Pb 80%-Sn alloy as temperature

###### Question:

1. Below is the phase diagram of Pb-Sn alloy. (a) Describe what happens to a 20%-Pb 80%-Sn alloy as temperature decreases from 300 °C to 50 °C; use sketches as needed. (b) When temperature is kept constant at 200 °C, describe what happens as the Sn concentration is increased from 10 wt% to 90 wt%; use sketches as needed. 100% Liquid Procutectic α 24% Eutectic α Liquid 76% Eutectic β Alloy I Alloy 2 Liquid 49% 327 Liquidus 300 Liquid i 250 - a +liquid Solidus 200 β+liquid Proeutectic a -51% 183 Solvus 150 Eutectie point 100 Solvus Proeutectic a 50 19.2 40.0 61.9 97.5 0102030405060708090100% 100% Sn Weight percent tin Eutectic β Pb Eutectic α

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