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quiz6fall00 - t ENSC 3313 Fall 2000 finswer 1 any 4...

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t '.. ENSC 3313, Fall 2000 Quiz 6 finswer any 4 Questions only, 1 point each In the AI-Mg system, state the compositions of a) the first solid formed and b) the last remaining liquid when a 90 w/o Mg alloy is cooled slowly from the melt. 1 Drawing temperature horizontals at the liquidus and solidus, as indicated, we get: a) -97 w/o Mg b) -73 w/o Mg In the Al-Mg system, state 2 alloy compositions that are 75% liquid at 500°C. 2. . The regions are a) (A.e ) + L and b) (Mg) + L a) We have O%L at 12 w/o Mg 100% L at 28 w/o Mg Hence, 75% L at -24 w/o Mg b) The boundaries are -74 (100% L) and 92 (0% L), hence 75% L at -78.5 w/o Mg. 3. In the A.e -Mg system, state what phases,and in what proportions, that the 13' phase decomposes into on heating. Above the f3' limit, we are in the ~ region. f3 -37 w/o Mg, y , -48 w/o Mg The ~' composition is -41 wlo Mg Hence ~ (41- 37) = y , (48 -41) and ~Iy' -714.
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v the AI-Mn system, assign ~ chemical fonnulae to the {3, y, ~1 and e phases. A- P.'centage M.x'9Qne.. 10 ~~ 40 50~ 70 80 90 ~:J .c 1400, r 1300 z..., 1200 z'oo, 1100 '...F f 1000 "OOF Extrapolating to top a/o scale: B12.
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