Question

7. Given the Eu-Ba (europium-barium) binary phase diagram: 1000 ppppp 1822°C Temperature °c (Eu,Ba) Eu Ba 0 10 20 30 40 50 60 70 Atomic Percent Barium For a 60 alo (atomic %) Ba- 40 a/o Eu alloy, at the following temperatures determine: i.) The phases present ii.) The composition of each phase present in atomic percent) iii.) The relative fraction (or relative percentage of each phase present) a.) T=775°C b.) T = 700 °C [9]

Answer 1

821°c 7280 W 20 30 to so to to & 90 100 @ T= 775°C At 770°c ie Point 3. From point A Phase Present it = = (Eu, Ba) & linid (2) Share tu, sa) + haund (o) Solid Composition of solid share a ce cca 30 atomic of Ba – 7o atomic to Eu Compositionat limid thase a = 75 atomico Bar as atimic l. En From '314 line, obtain relative fraction For solid phase, as ds - 4-6, -75-50 C4- 75-30 0.33 = 33° 2

Relative fraction of limid mare XL = l-aş 10. - 0.67 = 67 ( 6 i " at toooc le at Point 2' only solid phare exista Composition of solid phare will be some of original alley & Co be atomic tiba-40 otmic "6 Eu Reetative fraction =100% Cars I. since only single phase (solid Phase) erisits. {11)

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