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Quiz6spring2004 - ENSC 3313 Spring 2004 Quiz 6 ANSWERS Name...

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ENSC 3313, Spring 2004 Quiz 6 ANSWERS Name ________________________________ Answer any 4 questions only , 1 point each 1. In the sodium-thallium system, assign simple chemical formulae to the γ , δ , ε , and ξ phases. γ 17 a/o Tl, ~ Na 5 Tl δ 33 a/o Tl, ~ Na 2 Tl ε 50 a/o Tl, ~ NaTl ξ 66 a/o Tl, ~ NaTl 2 2. In the Na-Tl system, state the phases and their proportions that ‘ δ ’ decomposes into on heating Reading from the isotherm at 154 o C, I see that δ decomposes into liquid with ~77% Tl by weight and the solid phase is ε with ~86.4% Tl. The composition of the δ phase is ~82% Tl, hence use the lever rule to calculate the % ε: % 53 % 100 77 4 . 86 77 82 % × = ε Note: with the precision of this wt% thallium scale, our answer is only good to within ~+/-3% 3. Using the Pb-Sn phase diagram, locate and label all of the following: liquidus, solidus, solvus, invariant point, eutectic isotherm, terminal phases, eutectic composition. 327 300 T°C 200 100 0 Pb 20 40 60 80 Sn α 20 62 98 183 β 232 L α + L β + L α + β w/o Sn liquidus liquidus solidus solidus solvus solvus eutectic isotherm
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