ENGR 240 - 10.31.07

ENGR 240 - 10.31.07 - α all α with grains T4 α β α...

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ENGR 240 – October 31, 2007 Miscibility Gap o 2 similar phases o use the tie line and the lever rule to get the compositions Binary Eutectic Systems o 2 solid phases (α & β) o terminal solid solutions Handout o α Cu rich solid solution (contains some Ag) o β Ag rich solid solution (contains some Cu) o A max amount of Ag in the Cu phase o B max amount of Cu in the Ag phase o C eutectic point (the only composition where you go directly from liquid to solid); called three phase equilibrium (contains α, β, & liquid) Eutectic composition (C E ) Minimum melting point of the alloy (T E ) Eutectic Reaction Liquid  α + β Handout 2 o A. T1 L, all liquid T2 α, all α with grains o B. T1 L, all liquid T2 α + L, liquid with some α T3
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Unformatted text preview: α, all α with grains T4 α + β, α with bits of β o C. T1 L, all liquid T2 α + L, liquid with some α T3 α + L, just above T E C α = 7.9 wt% Ag C L = 71.9 wt% Ag w α = (71.9 – 40)/(71.9 – 7.9) = 49.8 wt% w L = 1 – w α = 50.2 wt% T4 α + β, all liquid present above T E goes to α + β primary α plain grains containing pure α eutectic solid striped grains containing α + β microconstituents w E = weight fraction of eutectic solid = w L just above T E w primary α = w α just above T E o D. T1 just above T E all liquid T2 just below T E α + β all eutectic solid o E. below T E contains eutectic solid and primary β grains o...
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