Mat. 33 Homework # 8 3/30/09 1) A) phases present: α + β phase compositions: C α = 5 wt % Sn C β = 98 wt % Sn weight compositions: W α = .89 W β = .11 B) phases present: β + L phase compositions: C L = 93 wt % Ag C β = 75 wt % Ag weight compositions: W L = .56 W β = .44 C) phases present: α phase compositions: C α = 100 wt % Sn weight compositions: W α = 1 D) phases present: L + Mg 2 Pb phase compositions: C L = 9 5 wt % Pb C (2Mg)Pb = 81 wt % Pb weight compositions: W L = .88 W (2Mg)Pb = .12 2) Yes it is possible; the approximate temperature would be 800 o C. 3) A) The first solid phase forms at around 1325 o C. B) α + L C) The liquid completely solidifies at around 1266
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