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Unformatted text preview: We can write E (69- 52) = L (79- 69) E 10 L 17 We have 100% B at- 71 w/o Sn. To the left, we have 0% B at -2 To the right, we have 0% B at -96 We need to move 1/5 of the way from B in each direction. To the left, the length is -71- 2 = 69 1/5 is- 14, so 71 -14 = .,?1 w/o Sn To the right, the length is -96- 71 = 25 1/5 of25 = 5, hence 71 + 5 = 1.2 w/o Sn 5. To what Mg-Sn alloy composition does this microstructure correspond? An intimate 2 phase mixture, hence a eutectic, hence at the V, hence ill w/o Sn. Glycol etchant (ASTM E407, No. 118) 250 X 3109 "Chinese script'. modificatlon of lamellar eutect~ in a casting. The eutectic consIsts of sharply angular Mg:Sn phase (dark) in Mg maQ1x (light) . You should have heard the name pearlite! What is pearlite? 6. The eutectoid microstructure of a. and Fe3C in steel, into which y iron (austenite) decomposes on cooling. ~...
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- Fall '11